I love the voice of the Wish Granter in Russian, Tvoya tsel zdes. Idi ka mne. Hearing the voices in Ukrainian sounds lame af. I played Radiophobia 3 in Ukrainian since it's the only one available and the whole experience was brought down a notch. It's like Polish, only worse, and Polish is already like sandpaper against your ear lobes.
Although I speak neither of these language, this is just based on how cool they sound to a non-speaker. Russian has that extra flair that makes it sound cool.
Are you sure it's because of the language and not because of the voice acting (intonation, delivery, actor's voice)?
I don't think I've ever played anything in Ukrainian, but regarding Polish/Russian (and other languages like German) it usually was up to specific actors rather than language used. I've heard plenty of examples where Polish was better than Russian and vice versa.
Are you sure it's not your personal prejudices influencing your reception? Don't be a retard, don't allow inferior emotions overtake your worldview.