In short, I think Volkl has a better reputation than Blizzard but a different feel. I haven't used either but Rossignol may be the closest thing to Blizzard. Long explanation below:
For top end race skis, there are only pretty minor differences between skis of a given length/radius combination. From what I can tell it comes down primarily to stiffness, which you have to go on brand reputation for and if they use titanal or titanium. Titanal is basically a proprietary version of aluminum 7075-T6 with improved tensile yield and machinability specifically suited to ski design. The "titanium" alloys used in skis are pretty crappy as far as titanium goes in terms of mechanical properties and really is pretty close to titanal as in all likelyhood they're mostly aluminum anyway (probably low beta series 5 Ti reinforced titanal). Basically titanal is both stronger and stiffer by mass and titanium is by volume, but both of these differences are fairly small. Also, titanium has a higher coefficient of restitution.
Given how this will effect the cross section design, a titanium ski tends to be more "lively" while titanal are more damp and "smooth". Either one could be more stiff depending on the cross section design, plates, and other parameters (and don't worry about strength, they're all fine).
Blizzard actually uses a magnesium alloy (the only manufacturer doing this for race stock skis to my knowledge), which is softer and weaker than titanal and thus probably very damp, maybe a little too soft for a race ski, idk. Head's liquidmetal (an amorphous zincronium alloy primarily alloyed with titanium and copper) is pretty similar to titanium for our purposes but slightly stiffer, stronger, & higher CoR. A notable deviation from my generalizations are the D2 Atomic skis which are, like all atomic race skis, titanium, but relatively soft with a large carbon fiber plate connected through viscoelastic mounted joints. I haven't tried these but have heard a lot of good things about them and if I was buying skis now, I'd probably go for those. Also, don't forget binding mounting positions heavily influence the behavior of a ski and is arguably the most important thing in tests of skis in the same class.