I haven't tried them all, but here's what I own and I'll point out my general likes/dislikes.
1000 Spike - Cool looking, easy to carry, not a very useful shape.
2000 Reflex (discontinued) - Large, lightweight, excellent utility blade shape, prone to blade play.
2550 Mini Reflex - This is Benchmade's best-ever EDC auto. I EDC'd a 1998 first run for many years and it still functions like new even though it looks well-used. Great handle ergonomics and blade shape/grind.
2750 Adamas - Toughest auto I've ever seen/used. I don't know how you could break it. It's only enemy is rust on the springs and D2 blade. Unfortunately, it's really heavy. The blade is also thick and the grind is steep so it's not suited for some cutting tasks.
3100 Benchmite (discontinued) - Tiny and ultra thin. Attach it to your keychain and forget about it. You'll always have a knife with you.
3150 Impel - Looks nice. Too big for keychain, too small to be a decent user. I presume it's a great seller in California due to the <2" blade length.
3300 Infidel - Looks cool. Not very useful. Bulky to carry. The 3310 would be a better choice as a user, but only if you really need effortless one-handed open and close.
3350 Mini Infidel - Looks cool. Not very useful.
5000 Presidio - Tough and surprisingly light, but mediocre handle ergonomics. The sharp corners all over the handle scales will wear the material in your pocket and also the anodizing wears off quickly with use and makes it look beat up.
6150 Mini Rukus (discontinued) - Benchmade's most ergonomic auto and probably their best ever all-around auto. Closest you can get now is the HK MP5, but I've never tried one.
9000 AFO (discontinued) - It's a 9050 without the safety. Wife carries a purple one camping and hiking.
9050 AFO (discontinued) - Good at everything, but not outstanding at anything. I carried one of these camping/hiking/fishing for years. I bought an Adamas to take on this duty, but switched back to the AFO. I carry in the sheath as I feel it's too big for pocket carry.
9051 AFO II - Better than the 9050 in every way except the extra weight and the bulky molle sheath.
9130 Stryker (discontinued) - This is a really good user. It's also an excellent EDC if you want something bigger than the 2550.
9350 Mini-Stryker (discontinued) - Great knife as it's just a smaller version of the 9130, but the 2550 is a better choice.