Lensable had the best offering for mail-in . They all seem to use the same lab on the backend, so I wouldn’t sweat the exact vendor. The coatings are all exactly the same.
If you want something in particular, I’d worry about the vendor (for example, most places won’t let you spec lenses darker than 80% rather than 90% or lens/mirror combos). They do this just to make the order engine on the website easier. SportRX dumbed down their options, but they still have the best orderform.
Trivex vs Poly - doesn’t really matter in terms of practical safety on the bike and the clarity is the same.
If these are just for the bike and not the car… and you ride pre-dawn / post dusk - Transitions xtractive mirrors are worth it.