Are there CS:GO cases with higher luck?

Nope, all CS:GO cases have the same odds when it comes to what you can get. It's all RNG (random number generation), so your chances of snagging that rare knife or skin are just as likely (or unlikely) with any case. That said, some cases do contain skins that are more valuable on the market, but that doesn't mean they have better odds of dropping those high-ticket items.

Actually, it's all about the luck of the draw. But, if you're looking for something specific, check out the case contents first. Each case has a different set of skins, so choose the one with the items you're hoping for. Still, remember it's all random in the end.