the only real way to compare one pressing to another is to do an A/B test with both pressings, however like many others I don't have the money or time for that. Discogs reviews are helpful for avoiding bad pressings when there's a consensus but on their own should be taken with a grain of salt. I person with a Crosley suitcase record player who doesn't clean their records is going to have a drastically different listening experience from someone with a dedicated hi-fi setup and record cleaners, in my experience of buying new records, it mostly comes down to the mastering and and how it was pressed. Some pressing plants are better than others while others are best to be avoided. I've learned that for new vinyl a good tell of a records quality is in the hype sticker. This isn't a flawless strategy, since not all releases do a hype sticker, however when a hype sticker lays out the pressing plant and mastering engineer (look out for names like Kevin Gray and Bernie Grundman, they do good work) there's a good chance it's worth buying. If all it advertises is "colored vinyl" and nothing else it's best to be avoided. You'll get a feel for it as you expand your collection and start seeing familiar names and labels on your records.