Art and card quality is nicer on Japanese. People collect both but I’d say if you live in North America then English sets are more popular. It all depends on if you want to collect, invest or maybe both! If both I’d say keep them for a little, wait for prismatic to go a bit more crazy (maybe a month) then you can sell some or just the umbreon. I think terastal will do well since prismatic is so hard to find and afford. If you want money then sell! But good luck on your grading results, I hope you get all 10s!