if it's edc then it needs to be
1. portable (aa/14500 biggest, aaa/10440 more ideal) it's better to have a smaller light that you will never question to bring. the best flashlight is the one with you.
2. flood beam (no tight spot, xpg with shallow reflector or xml with deeper)
3. low low(runtime/emergency, theater, going to bathroom, 1 lumen), general medium (40 lumen), high(80 for aaa format, 200 for aa format)
4. ui (depends who you sell too. cpf members (low-med-high), general public (med-low-high), law enforcement (high-med-low)
but if it's "expect the most" it's the portability...