DS3 is more replayable just based on the fact that there's so many different builds you can use. Sekiro is goat but there's pretty much just one playstyle.
Sekiro bosses have nothing on Dark Souls 3 imo
The dragon boss In sekiro was embarrassing.
I was like you guys know how to make dragons wtf is going on.
I liked some of the bosses from sekiro, particularly isshin and the ape. One was because he was hard as s*** and I learned him to a tee and the other because the monkey was cool.
But the other bosses werent that enjoyable to me.