I'm at the point in the game where I can get the Shura ending. I doubt I'll end up doing another playthrough. Not because I haven't enjoyed the game, but it's just not something I tend to do.
If you were to only do one ending in Sekiro, which would you go for?
For sure the return ending. I consider it to be the "canon" ending, Fountainhead Palace is always a joy to play through, SSI is amazing even though not exclusive to this ending.
It may be a little convoluted at first, but it's not too bad if you're using a guide/have done this ending before.