I'll go with Konecny. But, I'd specify some criteria. A break-out by a young player such as Svech doesn't really qualify for me, he's at a point significant natural progression is expected. Secondly, the next question is, is this season for real or an aberration. The prime example here is R. Strome riding a high-oiSH% and playing primarily with a top offensive player in the league. I don't like the odds of repeatability, especially if he's not with Panarin or a comparable player. Jarry is impressive, but I really have no faith in whether this is really him or its a hot-stretch.
Konecny is at the right age, playing on a good team so he isn't inflating raw-totals playing on a bad team getting a ton of minutes, has a previously high-pedigree where a breakout makes sense. I mean, its not really a breakout season if it just turns out to be a career year which the player never comes close to matching again. So, when that is all factored I'm going Konecny, not that others don't have valid arguments, a very similar one could be made for Vrana. I guess I just think Konecny is more likely to maintain playing at this level.