To answer the original question; in general I have found that button flys have more "give," and so tend to accomdate large packages better. At least I find them more comfortable. Also, especially if you tend to like your jeans more fitted you might try some of the stretch variety. I have a few pairs that are stretch and low rise that are quite comfortable. There is also a style called sport jeans which have a built in pouch in front that I find comfortable, but they are very "showy." Getting lots of looks is unavoidable with those jeans.
I too really like the low-rise jeans, which does present a "room" challenge. The most comfortable position is directly off to the side; however, I have heard that other people think I am hard when I position my cock that way. So, sometimes I will "double it" over in front, if I don't want it pointing off to the side, but sort of balled up like that it will bulge out more. And, positioning up doesn't work as I will stick above the waistband. Anyway, if you like low rise that is a consequence.
kilbasadad, yes I pretty much always show in my jeans, unless they are real loose and I am wearing very snug underwear. I just accept showing, which I don't mind most of the time.