Yeah, atm skill wise skye is better than sova.
But it's if you can use her, and there's a risk of team-flash if you use skye. And not a lot of people can use skye perfectly even in pro play.
Fyi I don't mean to trash them, but example is when fnatic team flash in final vs sen. It cost them a crucial round.
But on the other hand, sova is easier to use. 2 info gathering skill with 1 rechargeable. 2 darts for lineup, and the ULT is just too damn good.
So I think sova would still be more picked.