Peco turnouts have one advantage in particular, the spring-loaded snap-over feature, which is handy if you are manually switching them. What code are your Atlas turnouts? Peco Code 100 turnouts are really set up for British OO gage, though they work okay for U.S. equipment...mostly. Every once-in-a-while the guard rails on them are a bit too wide to prevent the wheels from picking the frog. Not always. But if they do, a .010" shim cemented to the inside of the guard rail will take care of the problem. Peco Code 83 are gaged for the U.S. HO market. Atlas turnouts in both Code 100 and Code 83 are fine, except they need some switch machine, either the above-the-ground Atlas machines, either manual or electric, or can be adapted to under-the-board machines. Peco turnouts can use their own switch machines, or some other, possibly with removal of the little snap-over springs (easy to do). I use both in Code 100 and only had to add the shims to the guard rails on one (1) Peco turnout.