Here I was complaining about Smurfville 2.0 earlier & I'd take Berggren over Alex Alex, but only because I don't think Alex is going to have much of an offensive game at the NHL level otherwise I like him a lot too.
Of course, if others thought Alex squared could produce offensively at the NHL level he'd be ranked a lot higher.
Alex has top 4 defensive D potential. Tough to play against etc., etc. But Berggren plays like Gallagher (not a perimeter player, willingness to go to the net) except with vision, passing skills & terrific puck control skills. Fantastic speed too. He has top 6 upside for sure. He could wind up as an Arvidsson type (who was taken in the 4th round).
Go with the guy with the higher upside & who can be an offensive contributor. Defensive D are a lot easier to draft then scoring forwards, which is why D fall & scoring forwards get taken early in most drafts.
Also, no way either is there at 35. I'd be shocked. Take the one that is there.