I think it's better for the planet if Trump wins. If Biden wins it would seem the more favourable outcome for the environmentalists and they won't push so hard, believing they have an ally (like what happened when Obama won, everyone thinking he would pull out of foreign wars, help the environment, protect whistleblowers etc. And how did that turn out?)
At least if Trump wins the campaigning groups and general public will gather in strength and cause more agitation and unrest. Biden will dampen those fires although do nothing at all (mere tokens) in ameliorating our planet's demise.