Wall is a better player than Kyrie because he's a far better defender, facilitator, rebounder and team leader. The scoring gap between wall and Kyrie isn't THAT huge. As much of a non shooter that wall is...he's been above 35% from 3 in 2 of his last 3 years....on about 4 attempts a game. Kyrie has a better jumper...is a more creative ball handler...and can break down the defense and can play off the ball better...which is beneficial on certain teams. Wall is also more durable.
I also believe Wall can play off the ball too. Kinda like Dwade Miami era a lil bit. Not that he will ever have to...or will...but he's capable of being that. The slashing instincts are there. I don't think Kyrie can play the role Wall has. And we've seen that when you ask Kyrie to be your PG and turn a franchise around....the end result is two straight back to back picks.
Wall was handed the keys to a possibly worse sht-show in DC. Playing with a starting lineup of Javale, Swaggy P, Jordan Crawdord, Andre Blatche . He was able to turn that eventually into two straight playoff appearances and playoff series wins.
Wall as your first option with average talent around him = 48-50 win team...and a series win...possible conference finals appearance.
Kyrie as your 1st option with average talent around him = 35-38 win team....low playoff seed....or lottery bound.
I think both of them are better as second options though. And two good young PG's...but I think Wall is better.