We bracket race asphalt and have the benefit of seeing performance changes from our ET slips. Because of home delivery convenience we've run more VP than anything but have used others though the years. Most methanol is just plain old 99.95% pure methanol alcohol and because of that we've not seen any one that's faster than another. I say go with whatever is easiest to get in your area and has the best price. If you stick with a reputable brand like VP, Torco, Renegade etc you'll be OK. What I've found is that a sealed pail or drum from any of the brand names will likely be fresh and 100% uncontaminated. Only twice have I ever got lousy fuel. Once from Ashland Oil that many of the local dirt track racers use (just didn't run well). Donated over a half a drum to our home track to use as "wash" alcohol. And once from a Sunoco distributor who filled from bulk that had a bunch of particles in the bottom of my can.
FYI - VP steel drums are lined and if kept sealed and off the floor your fuel will last a LONG time.