Hey Kahn,
You'll likely get a lot of different opinons on this here. I guess it really depnds on your end use of your sammy. Do you do any rock crawling? If so, I'd have to think the spoa would give better travel...that is if you combine it with longer springs, ala RRO wrangler conversion.
The brake dive thing almost seems to be an urban legend...although in emergency braking it may show up in spades! I had a SR on mine for a couple of weeks, and removed it, I thought it was causing a "death wobble" which turned out to be a bad tire...doh! I did not notice any brake dive in normal situations.
The SR might give you a little nicer ride, but I've been told the SPOA wrangler conversion is very plush. I have CJ springs in a spring under configuration nad I have plenty of room for 31" tires.
End the end, you probably can't do wrong with either lift...it just depends on which would work better for your situation.
D