Handicapping is such a difficult thing to do. There are traps that you inevitibly fall into without knowing it, and then there's traps you percieve and over-exaggerate. I've spent 7 years attacking every angle in every way and the most valuable lesson I've learned is to go AGAINST the types of things people in this thread have been talking about. There are so many things that come into play in a competitive game that you cannot make a list long enough. But, all that does is dilute any true edge you may have in any single category. There are a few factors that should ELIMINATE your thought process of being able to pick winners - either SU or ATS.
1) You cannot pick any team SU or ATS because there is an inherent bias towards one team or the other. Not even necessarily a rooting interest, but your memory will favor one over the other as well and you just don't know how that remembered game will affect the current one - if it affects it at all.
2) You cannot pick any team with a significant ATS number (spread) because neither team is playing to blowout, or cover the game.
3) You cannot pick any team with a low ATS number (spread) because it virtually becomes a SU game.
So, what exactly do I suggest? To just bet over/unders. I'll wait for a response then I'll go into greater detail. Thanks.