I platted both Tsushima and RotR and I can't imagine arguing it has better gameplay than Ronin. After finishing Ronin I kept coming back to it for several months just to mindlessly play the game, fight enemies, try different weapons and stances. I didn't do the same for Tsushima. In fact, at the final act in Tsushima I was already completely sick of the insanely boring and repetitive combat system and all the shitty filler Mongol camps. Tsushima just has really pretty graphics, better atmosphere, more meditative (sometime), more interesting and varied open world side stuff like the shrines and poems. Ronin has the drop on Tsushima by fucking light years when it comes to combat. I'm sure Yotei will improve all the bad stuff in Tsushima and have much better combat since they're adding desperately needed weapon variety, matchlocks, and shaking up the open world design so that it's less repetitive, but even Yotei won't have the amazing combat of RotR.