I think the best option is
SOS Mpowers. They’re a little on the pricier side of your options, but they’re worth it
IMO because they’re rugged (silicone housing/optic), bright as hell, and small/thin.
Alternatives:
Whelen T-ion duos are decent & slim.
The Feniex fusions are ok but I think they’re a little bulky, and I don’t think they’re as bright as the mpowers or ion duos; of the American made options, Feniex is the most economical option.
SNM has several duo color options & are overall the most economical
IMO, if you don’t mind private brand.
I’m not impressed with the Code 3 or FedSig lightheads.