For me 4* tourneys just seem like the best all around. You get a good balance of interesting hero options and accessibility to many players.
1*-2* is just poo flinging.
3* tourneys are ok, but ultimately there’s a lack of strategic heroes (even though recent additions and costumes have improved that). It always feels like sniper-on-sniper violence where whoever gets more mana wins, hardly anyone can stand more than a few hits.
5* bloody battle and buff booster are ok, but tough on thinner rosters, especially when color restricted.
5* rush attack is just ridiculous. Teams with heroes like Alberich and Kunchen are practically unbeatable if you don’t have a deep 5* team.
4* is best in all formats because there is so much variety on most rosters for experience players, even if F2P.