Different questions, same answers.
In Slimm's roster West has a 87 mid range, 81 3-pointer. Sessions has a 88 3-pointer. Kemba Walker has a 68 mid range, 72 3-pointer.
West has 68 defensive awareness and 80 on-ball defense. Sessions has 46 and 69. Walker has 43 and 69.
Walker is faster and the better passer. But I do not profit from a great passer when I have noone who can shoot the ball.
I know, in reality it would be different. But it is a game.
To be honest I got no clue where Slimm's rating come from in detail. But is by far the best roster for PC out there.