I see the OP hasn't posted again, would've been interested in the results. I have Blasters, a Scrambler & a Predator. Since , for better or worse, we tweak everything we touch, I can't really compare stock to stock ... I consider the Scrambler a utility quad in sport plastic
It's my tractor, but it's also my Wife's favorite ride at the dunes. At the beach where it's flat as far as you can see the Blaster & Scrambler are pretty close with the slight edge to Scrambler in 2wd. Close enough that anything like gearing, tuning, tire type/size, or even rider weight would probably make a difference. Neither can touch the Predator, but the Predator can't beat our YZ Blaster
... I needed the Scrambler in 4wd to build our trails ... but nothing can keep up with the little Blasters on the steep, tight trails. The Scrambler is surprisingly quick on the tight trails and more predictable in 2wd than 4wd ... The poor Predator can't make it through the trails without backing up in some places. I like'm all but the Blasters are just more fun to ride in most places.
So, basically stock, in a flat, strait line where ya race till it's obvious who has more top speed, I say Scrambler.