Throwing the first chairWhatever ski is strapped to my feet at any given time.
Okay, poor topic choice. Skis aren't like cars. You can't quantify them into true categories based on performance numbers. The attributes of a single pair of skis is too dynamic to directly compare to every other ski on the market. You can categorize skis into groups, and then chose the model that best suits you, but that is about it. It is your job to determine which group you fall into. (GS, SL, carving, park, back country, freeride/all-mountain, skierX, pipe...) The list goes on, but there are skis that fall into each group. What is the the best all round ski for one person may be horrible for the next guy/girl (gotta be PC).
My weapon of choice is a 165cm race stock Nordica slalom ski bound to bindings running a DIN of 14 and size 6 Nordica Dobermann 150 plug boots, beveled at 3 side .5 base with a 13 depth cross hatch and an 11 depth straight structure. Wanna take a ride? Probably not, but they do run nicely down a 40 degree ice skating rink.
The next person to reply might say that their explosives are the best (like the post above), or maybe their 6*, or an S12, or an RX8, or a B2, or a 666 Fusion, or a 777, or a B3, or a scratch BC, or a Legend, or a SG race ski, or a 9X stock, or a plain 9X, or an RC4 GS, or an RC4 RC, SC, or SL, ...see what I mean? Oops, I forgot the Metrons and Hot Rods - probably the best ticket to skiing nirvana on one board... BUT will they give up in powder? (YES) Will they give up on groomed? (YES) The point being that you will never have a ski that covers both ends of the spectrum perfectly. You might get some middle ground, but you wont get the full performance spectrum.
Prescription: Get lessons so that you can make any ski you're on look like the best ski out there. After all it is YOU that is skiing the mountain NOT the ski. If new skis start coming with a skills set then we'll talk...