This is in consideration of either ranked. Or in coordinated play.
Jett's main benefit. Her smoke gives her a little time after a dash to protect herself. Sure she can be sprayed and shit but its harder. That few seconds allows you to orient and attack on your terms. Waylay, doesn't, and if you dont dash properly its a literal one tap instantly.
Jett can entry with less support
Waylay requires much more support



