It’s always going to be a matter of taste and there is no right answer. No huge differences in practical performance there. In theory, it would depend on which modes you mostly use, but if you only used short bursts on turbo,

Out of the options you have given, I would choose the 35E any time, but would happily use either one in case it suddenly materialized on my desk.

I’m planning to use the 30Q in the FW3A for now. Mostly because I already have a few that currently see very little use. Another option might actually be better in such a lightweight FET triple. Top lumen performance is for a few seconds only and it’s a lot of thermal stress for a gain one will probably never really perceive.

With a 2.8 A linear driver the battery choice is not important at all beyond having a good quality known cell in good condition. I have some Samsung 26F cells for that purpose. I feel any better is a waste, but you might disagree. 35E will obviously be superior toward deeper discharge.