I use AW protected li-cos and naked IMRs, as well as some Kinoko IMRs and they seem to work well for me. I do use Tenergy Centura 9v LSD batteries and they've been fine for a couple of years, but I think that in the 16340 size, AW is still highly regarded.
they all suck. there's no japanese/korean 16340 cell so they're all chinese, but the DLG produced cells don't seem to be too bad. so just choose based on compatibility w/ your particular flashlight coz the sizes vary a LOT