My first option would be Embiid. He is the best two-way big-man in the league, and the second-best scorer in the league behind Harden He is also a very solid option on D
My second option is Kawhi Leonard. He is another great 2-way player, and would lock down the other teams best player each night. The only reason Embiid is ahead of Kawhi is because the Celtics really need a good big man