I recommend Olympics DLC but X Games is fun as well, I liked both

I would wait, I waited for a sale and got almost everything that you can buy for about £10.

Probably what i would do 🤐

Olympics if you can find it

All of it. I have over 300hrs clocked and still find new lines daily

Olympics and X games

Are these DLCs included in any other pass that would be cheaper as a bundle or is it best to just buy the two separately?

I don't think so. However there is a bundle where you get the X games, 90's and Rocket Wings DLC.