About six years ago, give or take, @IAmTheJody coordinated a massive 20,000 blade or more Voskhod group buy. I ended up with something like 4,000 blades. I have Voskhod blades stashed in every nook and cranny of this house. http://theshaveden.com/forums/threads/voskhod-blade-group-buy-closed.23197/
Gem stainless. I'd give up my DE's if I had to, but they'll have to pry my MMOC from my cold, dead hands...
Oh my.... there are so many blades out there currently in production which I have not tried yet. Right now, I'd have to say Wilkinson-Sword. I reserve the right to change my mind. After all, I used to be blond. Oh wait, my mustache still is!
Either Schick or Personna injectors work fine for me so no real preference. For Gem-style SEs it would be Gem PTFEs hands down. DE? Pretty much any blade made by a reputable manufacturer...
There are a few blades that I'd use if only one was available. Personna (various types), Polsilver, Bic Chrome Platinum, Treet Black Beauty, Rapira (various types), Voskhod and Feather. Also would like to try Gillette Silver Blues and if they're good, which I hear they are, any one of these blades I'd be happy to use if I could only use one. Yeah, a hard choice to narrow down to one blade.