I expect this thread will get move to another forum as it's not DL-specific, but my first suggestion to you would be to check the airports you use regularly and see if they even have a priority pass lounge (and if so, is the lounge in terminal that is accessible to you for your flight). Then you may want to look at the reviews of the lounge(s) you would use regularly.

Not that some lounges are only accessible to PP cardholders at certain times of day. Read the details carefully.

There area also some credit cards that include PP membership as a perk (for example the Chase Sapphire Reserve). The annual fees are not cheap of course for these cards.

https://www.prioritypass.com/airport-lounges