I'd rather keep OG than Siakam. OG is the kind of role player a championship team needs around Durant, an elite wing defender who can spot up for 3s. Siakam is a guy who needs the ball in his hands and thrives in the halfcourt predominantly against mediocre teams. Siakam isn't a dynamic playmaker, ballhandler, or creator, and I don't see him being nearly as effective if you have a guy like Durant soaking up so many possessions. In a playoff series, I would hands-down rather have OG being the primary guard against the likes of Harden, Butler, Middleton, even Giannis, than Siakam. OG is a better complimentary player and might have a bit of room to improve, whereas to me Siakam feels very much capped out on his potential. The difference in salaries between the two also means that in a potential Durant deal, if you keep OG, you'd also be able to hold onto Gary Trent, which would obviously add some much needed scoring depth.