re: Learn Finnish or Welsh?

If I go with either, it'd be my fourth language. I'm quite good at Russian and German and have managed to find native speakers to talk to. I've been back and forth with Mandarin, as soon as I make progress I lose interest and back off. Yes it's a bad habit. Neither Welsh or Finnish would be useful in Texas, but they're both truly unique. People here hear that you know something like Finnish or Russian they're like "wow"... if you tell them you speak Spanish, you're just like everyone else. Hope this makes sense.
And thank you very much for taking the time to give me some pointers on this subject. Kiitos! Diolch! Vielen Dank!