I don't think it's a matter that the 700 is better than the 70. I think the reason that the 700 is more prevalent is that there's more "stuff" available for it (aftermarket). In fact, after talking to Wally Hart and "Old man" Sinclair, the 70 is still the desired action for Palma-type/across the course matches. Another thing to consider is notice how many PSS's you see for sale lately, and how little Stealth's you see. I know Rem has been having QC troubles lately (chanbers out of line with bore, etc.). One guy at my range came in with a brand spanking new LTR (short PSS)and wouldn't group worth crap. Upon inspection the crown resembled a cheese grater more than a crown. Fortunately, I haven't had anything like that. I don't think you'll go wrong with either. If given a chance to do it over, I'd probably go with the Stealth (or VS) and spend the extra money on optics... Remember the only difference between the (.308) PSS and the VS is the stock. That's it. Contrary to what dealers will say, the PSS doesn't have a hand selected match barrel etc. Also, the "limited 5R barreled" run of PSS's ain't worth the extra dough. It's not a true (Obermeyer or Rock)5R, just a rough copy. Don't get me wrong, I love my PSS's. However, if most of your shooting will be from prone, then I'd lean towards the PSS. Otherwise I'd go Stealth.
HOpe this helps,
R