i'm working with someone on some paysites, and i'm trying to decide which gay niche to start with (i wish i could do them all!)

18-20 year old boys jacking off
big dick twinks
rough men (tats, leather, real construction workers, etc)
college boys jerking for money
bodybuilders (only big dudes, no kinda sorta muscular ones)
twink feet/socks
chubs
black and young

which one would you do or promote?