PlayStation Plus Essential is the same as the original PlayStation Plus as you will get online multiplayer access, cloud save backups, exclusive discounts and downloadable monthly games.
PlayStation Plus Extra comes with all of the benefits included in PlayStation Plus Essential and adds a curated list of downloadable PS4 and PS5 games.
PlayStation Plus Deluxe gets all benefits from the Essential and Extra tiers. You will also gain access to downloadable PS1, PS2 and PSP games in addition to free game trials.
PlayStation Plus Premium comes with all the benefits from the Essential, Extra and Deluxe tiers. The exclusive features for this version include the ability to stream PS1, PS2, PSP and PS4 games. Premium is also the only tier where you can play a curated list of streamable PS3 games.