I'm sure others will have better first-hand input on this, but, from all that I've heard, the Rampage will be far too much for dry. If those two are your only options, I'd go with the Slay/R. If you are open to others, consider these:
Punisher
Power Groove Dry/R
Blazing Inferno (Regular or Hard on sale for $80 shipped at bowlingball.com)
Lane 1 Bullet (Big B pours them after all
)
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I can't bowl 300, but I can bench 345 : )
I provide the muscle for the Fellowship of the Saws