@tas38 An angel investors as far as I've seen stay with you between resets. Nobody is really sure about what dictates how many investors you get yet, but resetting for one investor is not worth it. To answer another part, the reset is doing exactly that, resetting your progress with the bonuses from Angel Investors.
Fed my ultimate beetles nothing but pills and a few grapes for health until they were 100 days old...now they are bigger than the swing set and can pretty much eat any other bug in the fighting arena.