Honestly, I think Evans is going to be the better player. I think he is just a special basketball player, while Wall is a special athlete. However, Wall is the concensus #1, so you have to either take him, or trade down.
I don't think you can take Turner just because you have a PG though. If you think Wall is the better player, then you need to take him. But I think the case can be made that Turner is going to be the better player.