Let's break down this multiple dimensional inquiry. It's a loaded inquiry, but we'll do our best to answer your question segments.
I want to know, not routines, but straight up jelqing say hands or device just normally, OR pumping 7-15hg, minute per minute what gains are better/bigger in girth?
Long answer short, straight up pumping or jelqing CAN increase girth. Pumping or jelqing by itself will not yield the same gains compared to the combination of the two exercises, or combination of exercises in a routine. You don't want to know about the routines, but exercise-specific within a routine and analyze for the gains. Jelqing alone to induce positive internal pressure cannot beat higher negative pressure to pull in more blood. Pumping using negative pressure alone cannot compensate for positive pressure internal expansion. Neither pumping or jelqing, or combination of both, can gain as much as adding part of the lengthening exercise on top of the two. It must be a combination of exercises.
The question should be, "How much more effective is one exercise over another?" Pumping vs jelqing, both are the same. Gain is at the same rate, ONLY and ONY if the exercise is done properly.
Just like length exercises can promote some "girth" gains. Girth exercises can promote some "length" gain. For example, if you're doing jelqing, and adding pulling/tugging elements into the jelq, you're essentially create a traction force to help with length gain while doing girth.
Same with the pumping. Pumping using a proper
cylinder, roughly around 0.5in larger in circumference, creates elongation pull as the penile shaft expands and compressed against the wall. That tugging/pulling effect from the negative vacuum does promote length exercise and gains. How much length gain depending on how much the pulling force is. For example, if your pulling force in the
cylinder is around 2in, you're creating around 5lbs of pulling force. This is why
Bathmate has so much marking based on a -6.5 to -8inHg of vacuum.
MityVac comes standard with the marking to provide proper bonepressed pull, mimicking the tug/traction force effect. Once the penis can't be pulled in the
cylinder any more, if you're able to squeeze out another 0.5in of pull, you're doubling the traction force pull by around 11lbs. Why? Once your tissues can't be pulled any more, and you're forcing it to extend further by 0.5in, that's some heavy pulling there. Every 0.25in there after, you're adding around 1.5x to 1.7x the traction load. At this point, you're probably going past -25inhg.
Which gains are more long term?
Long term gains? There are only two phases: the temporary gains after the exercises, or "possible gain effect", or permanent gains. If you're comparing if pumping or jelqing provides better permanent gains, then it's equal.
Jelqing vs stretching also what's the difference in length gains?
Jelqing is a combination of promoting blood flow into the penis, while exerting less pulling/traction force. Stretching is fully pulling/tugging. However, stretching can contain a compression jelqing element, by holding the blood volume using the OK grip at the base of the penis, and one hand holding at the base of the glans. As you aggressively pull, you're forcing blood into into the blood chamber along the tunica, creating a moderate compression load to expand the chambers, while your other hand is creating a maximized pulling/traction load to stretch your tissues and ligaments.
Is a misnomer to point out jelqing is not stretching, and stretching is not jelqing. They're similar in many ways, unless you only grab the base of your glans to pull. When you do that, you're still increasing a portion of the penis, which is the glans. I do that as well, to make my glans turned into a mushroom. Wife loves it.
Minute per minute and long term if I jelq 30 minutes a day for 6-8 months then switched to intense stretches only 30 minutes a day for six months, what kind of difference in length gains will there be? What about the estimated difference in any girth?
The tissues adopt dynamically from one point of your journey to another. If you use average weighed comparision, you're completely tossing the data out the door because you can't compare the starting point to the middle point, and the middle point to the point somewhere a year later. Remember, your body adapts to various methods you're using. To prevent the body from adapting and reducing your growth rate, you have to use different approaches to only enable the body to adopt to the changes, and not adapt.
But for simplicity sake, let's say a newbie does the jelqing 30 minutes a day for the first 8 months, then switch fully to 30 minutes of stretching per day for the next 8 months, as I said before, jelqing and stretching is similar in nature, depending on how it's used. Using a variable traction force from light, to moderate, to heavy, back to moderate, and back to light for both jelqing and stretching, the average data points collected from length gains is around 0.025in per month using hand strength only. This is the most optimistic gain using hands only. If you're using a device or assistance from tools, such as a chair, a broomstick, an edge of something, a
Length Master or fulcrum device, combined with your own arm strength and body
weight, the average gain is around 0.1in per month.
Remember, this is just average data points. Each person is different because of their physiological conditions, dietary balance, recovery factor, mental and emotion well-being, and many other combination of environmental exposures, it's practically impossible to put them all into an equation and claim it's the only predictive model you can use to calculate for gains. No one in their freaking right mind will do that. This is why this community works like mad to provide baseline data collection so we can compare unique cases, and guide the brothers with proper routines for their expectation of gains.