I have to agree with the A2 consensus...but it's my number two, just my opinion:
I'm a huge M2 fan. I own a few. IMO, no one else came close to a D26 offering with the shock absorbing bezel like SF did with their M2. I've lost a few lamps in a standard SF light without the shock absorbing bezel, but none in an M2. I use mine everyday, at work as a tech in the Air Force, home, in my hobbies like working on my trucks...it holds up.
That and my favorite D26 lamp is the P61. Yes, I know runtime sucks. Yes I know primaries are a pain...but I think there is only one lamp that trumps it in output (LF IMR 9), and even then I'm not sure if two 18350's could allow that lamp to throw more lumens than a P61 on fresh primaries in a P60 compatible host. That's debatable I suppose...
I've seen some threads where folks claim they can't tell the difference between a P61 and a P60, But I sure as heck can.
M2 gets my vote. Endless mods, compatibility, can still be EDC'd (IMO, as I do), many of them still out there (you can obviously make an M2 with just the bezel and a C2 if it's not in your budget...
Plus, I can dissemble every single part of my M2 and acquire replacements without difficulty. Glass, tailcap, etc...I know it's much more difficult to find replacement parts for my A2's.