The tournament format would interest me most because its rules can give a familiar slot a different context. I'd first examine the qualifying games, dates and scoring method, then look at the leaderboard presentation. Cashback is another useful category to understand because its calculation differs from free spins or a deposit match. In the UK promotions information on
https://slotorado.uk/, the welcome package is presented alongside references to cashback, loyalty rewards and slot tournaments such as Endless Wins and Spin Storm. Those competitions are described as past events, so I'd check the current promotions page for active offers. I enjoy comparing promotions according to their own terms rather than treating all rewards as equivalent. A clear calendar with each event's start and end dates would make that straightforward.