I voted for a new tank, I would pick the 2nd one any day over the FH for myself if they were in an aquarium store. BUT if they were my fish that I had raised I'd keep them both.
Keep the one without the tumor on its head... I've never understood what people find appealing about that. (no offense intended). Maybe the same reason I don't like dogs that look like they've been run over by a steam roller (pugs, bulldogs etc.)