A 1"three blade fixed head, or a 2"three blade mechanical?? (any brand, make one up)
Can I answer too?
Obviously the mechanical since it isexactly twice as big in diameter and total cutting ability (or surface).
But a three blade 1.375" diameter vs. a two blade 2" diameter, flip a coin.
Or... a three balde fixed1.5" diameter vs. a 2 blade 2" diameterI will take the fixed 1.5" three blade head.