AS and guardians are definitely similar... I prefer AS rules slightly over guardians. The supers on AS is a better rule set to me e.g. super ramps etc.
As for the pop bumper post.. I've owned a pro and an LE. I've had the post in and out and I really dont see the point in removing it... I prefer keeping the ball restricted in the pops as designed. Too me your giving in one aspect but also taking away from another... but each to their own.