I've been considering Stadler and K4 and Cage. They seem to be very similar.
Which requires the least to learn for the fastest speed ? ( I don't need to be very fast, I want something that can be sub-1min for someone fast using the full method, but relatively easily to average sub-2 min for someone new learning only part of the method. I'm at about 2:40 with reduction)
A noob version of K4 with only 3 algs was the first way I've used to solve the 4x4. It sucked—350+ move count. Reduction is about 160 for me now.