Not a huge collection by any means, but with over 40 Spydie folders, this type of question is always challenging. Fun to think about, but also could probably list a dozen "top 3's."
Today I'll go with:
Baby Horn: An unexpected all-time favorite. Like everything about it as a "modern traditional." Solid and compact, great blade shape, unintimidating.
UKPK: Would like to say the HH exclusive, but frns are carried the most, especially in the summer when weight matters more. Never expected to become such a big fan of Spyderco's Slipits (have lots more,) but they've never let me down.
Pac Salt 1: Going with my newest aquisition here, black/black PE, (also have a yellow SE inbound). Have a couple other contenders here for my large folder, but am really impressed by how slim and light the Pac 1 is, how well it carries, etc. Also had been missing a "blacked out" knife in my collection since I sold my black/dlc Para2. If I could get a dlc lefty Military or Para2, one of them might have snuck into this spot, but it's probably not gonna happen and I can hardly complain about discovering the Pac Salt.