I only put one fertilizer on my lawn and that is the early season scotts for crab grass.. It works. I put it in the front yard, little grab grass, only on the edges of the drive way. Back yard with the well, none and its grab grass everywhere.
Edit: my front lawn is 60% grass, 30% clover and 10 percent others (some sort of ivy). I am fine with that. The clover is very hardy. Only down side is it attracts rabbit.