For me, it would depend on the course, mostly length of holes and tightness of course, but if forced to play an unknown course with only three discs out of my bag, they'd be:
Driver = Beast
Mid = Buzzz
Putter = Soft APX
Believe it or not, the mid was my dilemma. Tough choice between Buzz & Soft Challenger (yes, I realize how different they are). Use my overworked Challenger for so many upshots, my Buzzz feels a bit neglected. Lately, my buzz only sees action on long holes where my drive doesn't get me into Challenger range. But if forced to whittle down to only 3 for a given round,I thought , "Can you really go wrong with a Buzzz?"
Going in blind, I'd say Buzzz, but I wonder how many times I'd throw it and and think, "Damn! Wish I had my Challenger."