My favorite is in this thread. https://www.xdforum.com/forum/f23/my-favorite-122/ Of these four I guess it would be the top one, the Paragon because it is spring loaded out the front type and the blade comes out fast. It's not a work type knife but for defense.
This is not even 1/8 of the collection. Probably close to 45-50 in the collection from over the years. Haven't even started on the fixed blades yet.