Played neither so I'm unbiased. Death stranding, from what I've seen and heard is just a walking mailman simulator with boss fights. Ghost of Tsushima looks is similar to Elden Ring or a Far Cry game. if I had to choose I'll pick the ghost one as it just sounds better to play.
I spent about two years loudly proclaiming to my friend circle that Ghost of Tsushima was the finest single video game ever developed.
Meanwhile, Kojima replaced David Hayter with Kiefer Sutherland, and that reality somehow soured my entire experience of DS.
I tried getting into Death Stranding two different times, and both times I gave up because the game didn't hook me.
Ghost of Tsushima is enjoyable for what it is, more of a refined Assassins Creed.