Heritage is really only good for retail IMO.
Contenders is what I am thinking about busting in a week or 2.. HUGE hit or miss. Hit a Cutler, or another SP, that is a couple hundred easy. Bush, couple hundred. Young, couple hundred. Colston, get most of your box back. BUT, you can get guys like Jeff Webb, or other no-names, and low sellers....
Gridiron Gear, I just haven't ever liked because the lack of RC Autos... Don't get me wrong, you can get great patch/autos, and nice 1/1s etc.. least risk for 4 hits I think...
SPA I don't think is as bad as I thought it was... Patches come 1:2 boxes...