[2023] Which version to buy?

To add to the other posts, the bundles on Steam are kinda like a shelf. If you get one, you get what's currently in it at the total price + a discount. When a new DLC is released it goes onto the same shelf, and the price of buying goes up - you won't own it, but you can acquire it at a discount. It's a bit weird to wrap your head around, but it's basically a way to get all the current DLCs at a discount.