From what i've seen polearm not worth using on sam for this month ambuscade, 32k impulse avg vs 37k fudo avg, same player.
Damn, don't call out your SAM friend like that. Pretty sure player warnings are against the forum rules.
But really, the polearm takes a different playstyle to use correctly. Due to how Impulse scales and crits based on high TP, you don't just spam as fast as you can, you have to wait for 2000~ TP, which SAM is amazing at. Not to mention, Pole build should be getting Crit roll instead of DA for optimal damage.
With that said, my own testing has shown Shining One used optimally and R15 Masa are basically tied. I personally give the lead to R15 Masa because of AM3, Fudo has better SC properties and isn't tied to a roll that only benefits them.