Honestly I would advise you don’t invest 10k in either. Bitcoin Gold is a fork that has no real use and could very well disappear overnight, so I wouldn’t recommend any large investments into that. Litecoin has it’s uses (mainly because it’s low fees allow transferring between exchanges), and has the benefit of being tested by time; however it just went up like crazy so it’s probably not going to rise again very soon (especially since as Bitcoin rises if it sits at the same price you effectively lose money).