For the most part, plastic is plastic.  They all do about the same thing.  The exceptions I can think of:
1) Lane #1 XXXL has a "real" core in it, which gives it a little more motion and better carry than other plastic balls if you want to use it as a strike ball on drier lanes.
2) Storm's Ice Storm has an 85-87 D-scale hardness rating, which is the highest on the market right now (I believe it's the same hardness as the old Blue Dots).  This generally means it will go pretty darn straight.

Otherwise, the only real differences are looks and price.

Thanks guys.
 I am actually looking for something I can use for a strike ball on drier conditions. I guess I should have said that the first time.
I was thinking of getting the XXXL, but I wasn't sure if there was anything out there that was comparable to it in plastic or something else.

One "precision"...

ALL bowling balls are "plastic"... plastic is a generic term (used in this case) for a wide variety of polymers ... polyester is a specific kind of polymer... so the one you are talking about here are mainly polyesters... (polyester balls)

I know that 99% of the people when say "plastic" are understood (they are referencing polyester) but the right way in this case is the polyester word...

Just my 2 cents!

=)

I know its not a plastic ball, but I use my Roto Grip Neptune for spare and for when the lanes a just a little bit toasted.  I can get it to go as straight as a plastic ball, but also have some decent movement on drier lanes.

Very useful ball to have in the bag.
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University at Albany 2007
    -Let's Go Danes-

ROTO GRIP - King of Them All

Thanks slash, I'll check it out.

hammer rayzer was created for exactly what your talking about. Give it a look.
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Track Robo Rule
Columbia Flip-Side Wicked
Hammer Raw Doom Red
Ebonite Black Ice
White Dot

My league lineup