If you liked the first Hitman 2016, you’ll also like the other two. The replay value is excellent and this format and gameplay style is the best Hitman has ever been.
We've not got experience with the PSVR version but best I can tell there's still no native PS5 version supporting VR. If you've got the adapter to run the PSVR1 and a Dualshock 4 (it needs the light bar), you should be able to download the PS4 version from your library and launch into the VR mode through that.
Trying to figure out what you're getting is a mess on mess on all platforms, but I believe the code our reviewer got was for the World of Assassination "Deluxe Edition" which is Hitman 1 GOTY, 2 with DLC, and 3 with DLC. The standard version is Hitman 1 GOTY + 2 and 3 without DLC. The World of Assassination: Part 1 is just Hitman 1 GOTY (albeit all with the updated engine improvements/visuals)
It's a bit weird compared to other storefronts as I think it took a while for a native PS5 version to arrive. There's the World of Assassination bundle (Hitman 1, 2, and 3 base games), the World of Assassination Deluxe bundle (Hitman 1, 2, and 3 base games + all DLC), and World of Assassination Part One (Hitman 1 + DLC updated to run in the latest build of the engine). All of them are PS4+PS5 versions as I think you still need to use the PS4 version to play it in VR