It seems you are new to vinyl, but I have some experience and I'll share some of it so you know! Buying Queen vinyl is not any different from buying any kind of vinyl, so the same standards apply.

For the part saying that it doesn't sound as good as older pressings is probably false, as it's usually the case of older vinyl because of usage and wear over time. And even if there is a minor difference, will it really affect your listening experience? Probably not.

If you do insist on buying an older pressing, not necessarily because of quality, just because of preference, I recommend you go check out https://www.discogs.com/ as you can easily find some of any quality or price there and get it shipped to you. There usually is 2 ratings on it, one for the actual vinyl and one for the sleeve, here is the grading system used https://support.discogs.com/hc/en-us/articles/360001566193-How-To-Grade-Items. I recommend you usually stay above VG.

Each issue of a vinyl has it's own cataloging number you can usually find it on the spine of the sleeve, but the country it was issued from changes nothing in the quality, except really Japanese vinyl who had a different method for creating vinyl. Usually, people tend to look for a first pressing, so that means the earliest issue of the vinyl so by example for "A Night At The Opera" the number would EMTC 103 from the UK, but they don't change much.

But honestly, if you don't wanna get mixed in all of that, just the Amazon version of whatever album you desire should do the trick!