The ones that have cats waiting for me in them! Those are my favorite.
I am still learning about traps and only have one brand that i use. I have Sleepy Creek #4 and #3 coil spring traps. The reason I use them besides the fact they are made in the USA is I purchased a dozen to try and had great results right out of the box. The first one i ever set took two consecutive giant Toms and that made me a believer. I know any good trap would do the same it just set the tone for me to stick with them and i ended up buying another 7 dozen. I have since learned quite allot more about traps and trap brands, that being said there are allot of options out there and you will have to figure out what you like best.