Does your baby have a bad reaction with Enfamil or is a better deal the reason you want to switch? I personally love Enfamil (we used the Enfamil Lipil ProSobee, the soy kind), but it is way too expensive. We use the Target soy brand now. Compare labels and its exactly the same, just $10 cheaper.
I've always heard that Enfamil is better because it has a closer ratio of whey-to-casein to breastmilk.
"Enfamil promotes a 60/40 whey-to-casein ratio similar to human milk. Actually, a 70/30 whey/casein ratio is more typical of human milk, and the whey content of some human milk can be as high as 80 percent." - from Dr. Sear's website on bottle-feeding.
Of course, let your baby be the guide. All formulas meet federal regulations, so do what works for the little one!