My buddy has both of them, drilled about the same. The FAZ seems to handle a little more oil, and isn't so condition specific. His Slash really shines when they dry up a little bit, and the shot breaks down. For some reason, the Slash shows alot of track wear really early, like after 8-10 games or so.
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Bring The Pain.

I agree with Excaliber on both counts:  The FAZ starts up earlier for me, and the Slash is smoother when reading oil and dry.  

I have a stronger drill on my Slash and a control drill with polish on my FAZ, so FOR ME, the Slash hooks more because it's just a tough stronger at the breakpoint while reading a little more oil up front.  (Had I drilled both balls at the same time, I wouldn't have drilled them both in the manner that I did.)

For anyone else, the FAZ would handle more oil, as it would roll earlier and likely have as strong of a breakpoint as the Slash.  If you have an arsenal of 5+ balls, I could justify having both, especially if you sanded the FAZ.
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Jeff Voght
PBA Eastern Region Member