Rodinal is a great developer. it can make the negatives look slightly more grainy than some other developers. be aware that their are many folks who have an opinion of their favorite developer. None of them are wrong for their own purposes, but they might not be optimal for yours. The "standard" is probably D76. Rodinal with the generally long shelf life and easy dilution ratios is quite useful as a starting point. It is certainly one that I used in my early days learning my way around the darkroom.