For me, only M60s are in my C2's & Z2's, because they are for use with my handguns (CCW). I also only use M60's in my 6 & 9P's (metal SF's get M60's; see the theme here, LOL). My G2ZL's, black G2L's, & G3L's only get M60L's. My yellow G2L's only get M60LL's. Using this method I ALWAYS know what I am getting, whatever light I pick up. It may not work for you, put it works well for me.
So for me, I see NO reason to have anything BUT an M60 in a C2, C3, or Z2 (all Tactical lights to me, why else would I spend almost twice the price of a 6 or 9P, but to each his own). And as to the Flood versions, no thank you, I'll use my SF 34 diffuser's and then have 2 lights-in-one, If & WHEN I need flood.
As always, My .02 FWIW YMMV.....