I’ve used many different brakes, avid and formula being my faves avid r are about the best for the money generally but if you can get xx for £99 per end then go for it , ive never used xx but they will surely be lighter with the same amount of power as the r’s.
Elixir can be awkward to bleed but when working correctly I don’t think anything matches them at similiar price point for power.
It’s rare people talk about the lower end formulas i.e k18’s on here but they are very powerfull and feel great.
As for hope as much as I love them as a brand I just cannot get on with their brakes ( ducks head ) I personally find them underpowered, the adjustability is great though and they are second to none for customer service.
If you are happy getting your head around the avid bleed process I’d go for the xx or the r
Just my ten cents for what it’s worth.