If we’re going with the knowledge of how their careers will unfold, I’d go Ovi.
Lidstrom is the biggest argument to me in this scenario with HM to Sakic both one franchise players with Cups but I’d take the skill and entertainment of Ovi.
Jagr is going to be amazing and then get a little weird and dip from your team in a decade.
Lindros is going to be dominant then get his egg cracked.
Bourque is going to be an all timer but have to leave you to win a Cup which means you never do.
Leon and Mac still have careers to lay out compared to the other greats.
If this is a hypothetical you get any player at 18 with a clean slate ahead, I’m taking Lindros and teaching him how to skate with his head up before he hits NHL ice.