MGC:
Pros - Fast, flexible, good corner cutting, low price, responds well to lube.
Cons - Pops easily, difficult to reassemble.
Ambition:
Pros - Stable, decently quick, almost never pops, very easy to reassemble.
Cons - Not very easy to lube, doesn't have the best corner cutting.
WRM -
Pros - Fast, flexible, responds well to lube, small.
Cons - Expensive, takes a lot of break in, corner cutting is meh.