Do you decide which creature takes the on-hit effects before, or after rolling? If it's after, there's an obvious major advantage to getting a much higher chance of triggering them.

@TheFallen0ne it's not actually referencing your hit point total anywhere, other than that one of the ways to become dead is by not having any and failing death saves. It's also not stated anywhere that gaining (or having) hitpoints can bring you back to life; it's assumed people understand that death is pretty final unless an effect explicitly states that it brings you back to life. Raise Dead does, and it says you return to life with 1 hit point, regardless of how many you had. Polymorph does not. Even if Polymorph gives you all your HP, you're still dead, and after Raise dead you'd have 1

It might return to its previous hit point total, but that won't do it much good, because it'll still be dead. Ending polymorph doesn't end conditions on the targets. It doesn't stop curses, it doesn't stop ongoing spells, it doesn't even stop being prone, and it also doesn't stop being dead.

You bring up "in combat", but I'm assuming your question isn't asking about sneaking around in combat?