It’s definitely not going to be worth it at all to open japanese packs with these normal pull rates of 3-4 AR +1 master ball (which btw don’t even feel like actual hits since most chase pokemon are legendaries in this set and they don’t have a non ex card so they can’t be reverse holos) +1 SR or above. Just too many cards, it’s way cheaper to just wait a couple months and then buy singles unless you somehow manage to get boxes for ~70 bucks (which is still almost double the msrp) instead of the ~140 most stores are charging now.
For english though, we really don’t know. Not once in history has english had better pull rates than japanese. But the stolen packs had really good pull rates although being quite a small sample. I guess we’ll have to wait and see.