I am actually interested in both. But my main priority now is length.
I started doing girth recently just because sometimes when I feel really horny and have really high EQ, I think its better to use this for edging and girth work rather than to bust a nut. And also I feel like doing a bit of girth work on the side helps me with my length sessions too, but keeping my flaccid nice and full.
But as I said, my number one priority is length now. Thats why Im doing mini length work also before bed (as second length session). But if I manage to gain also some girth, that would be amazing.