A lot of it is preference. The models are very similar, with mostly cosmetic or small functional differences (ambi safety, different beavertail, etc.)
It's also pointless to compare the double/single stackers. They're just different.
For single stack, probably the FBI Trial, or the new Wilson CQB. Top of the line with all the goodies.
For double stack, probably the 5 Inch Limited. (which you really can't find anymore) The customization potential was almost endless.