The Trinity Switchblade front suspension was the best. However, even experienced racers dreaded setting it up.

The AE Dynamic front end is the next best thing. Its really easy to setup but you will have to replace upper arms if you crash a lot. Once the upper arms get sloppy on their hinge pins the handling gets really erratic.

The old AE front end....I guess it works OK on carpet where you have lots of traction but it is near useless on asphalt. The molds for the old front end are old and are setup to work with a low fiber content nylon. This makes the old front end flexy and easy to bend in crashes.

If you are a competitive racer the latest L4 front end is the way to go.