I’d agree with @Sviatogor, mainly because Ukrainian is easier to learn than Polish. Both languages share a lot of vocabulary, but Ukrainian is better imho because it opens more opportunities for understanding other Slavic languages, such as Russian, Slovak, and surrounding languages (and apparently Macedonian and Bulgarian, as one friend of mine from Macedonia told me when we last saw each other). However, you do you. I’ll still recommend Ukrainian over Polish any day. Love both languages nonetheless.