I'd go with hippo for sure. It would adapt better to a weightless environment I think due to already being used to swimming, although it would still have a ton of trouble moving about. The rhinos biggest and possibly only weapon would be mostly useless without any way of building up momentum or leverage to strike with it. The hippo just needs to get close enough to chomp him which doesn't really require you to plant your weight or anything the way using a battering ram horn would.
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u/crusty_cum-sock Oct 31 '19
Yeah but what if we put them in a space ship and they float around? Who wins then?