which tests? Advan sport v105 was tested against many max performace tires and it's just a shy bit under PSS
http://www.tirerack.com/tires/tests/videoD...ay.jsp?ttid=174

PS3 is UHP which isn't the same level as Max performance category.

do consider comparing tires of the same category, and quite honestly no tires have matched up against PSS even until today.
The only drawback is the pricing which TS is reluctant to spend on again.

you must be confused with the old advan sport and the newer advan v105

in fact, theres few feedback that Yokohama S drive is better than PS3 in dry grip/heat cycles. Both are UHP, and that's fair/reasonable.
Advan sport v105 is on max performance and performance should be on par, if not better. in addition to better comfort/NVH.

Max performance category is basically for people who want EVERYTHING in their tires, and don't mind paying a premium.

=edit=
typo

dry yeah, however wet and nvh ps3 is better, so most people would prefer ps3 as a good all rounder.

directional is actually better for the most part except for nvh purposes.
if you haven't realized, the huge majority of extreme tires, semi slicks are pretty much directional. with only few exceptions such as bridgestone and michelin taking a different approach going asymmetric, and utilizes superior compound to offset the minor disadvantage of being asymmetrical (although that itself has numerous advantages over directional, mainly on inner/outer compound/tread designs)

i mean, if large shoulder blocks is what you're after, S drive have really huge ones as opposed to the smaller ones on ps3, with grooves in between and within the blocks, on 1 side only no less:


so just by shoulder blocks alone, you can tell which will have an advantage.

However with damn thick (and most likely stiff) shoulder blocks, almost semi slick looking, your biggest drawback will be nvh.

as for s drive pricing, if you're talking about 15" sizes, it's about c drive 2 price thanks to YHI's recent promotion on Yokohama S drive.

need i say more?