The whole ranged attack/multiple targets/full damage thing aside for the moment, which do you think will be more devastating to infantry formations, anti-personnel, or full strike?
My vote is for full strike just because it gets you when you've got a mech pinned down and primed for capture or other nastiness. That and it is easier to time the attack without pushing or other maneuvering.

AnP - much easier to get the shot, and much more versatile.

With AnP, you can hit an arty piece for moderate damage, but chew through his meat shield in one or two shots.

Full strike will hit those infnatry that based you, but did not base each other, provided they are in front arc.

Hmm, To me, it depends on the design of the mech

Considering the pathetically low defenses of the two mechs that have Full Strike, AnP is still king.

Which would you rather have: Full Strike (which is somewhat redundant with shakeoff damage), or AnP and shakeoff damage potential?

Give me AnP any day.

I say all we need is a mech with full strike and a big-### single target ballistic damage value ;-

Anti-P is way more versatile. How often are you going to get based by infantry that aren't basing each other. What a waste of the opponents orders. If they actually base you with 2 squads of infantry, you'd better be running regardless - just do the break away damage and avoid capture. The only time I think Full Strike is going to be better is if you manage to base 2 vehicles with 1 mech. People won't base you in a manner to let you use Full Strike, so you'll have to set it up.

If it has less than 22 defense, Anti-Personnel all the way! :)