Drouin is clutch, indeed, and at his best when guys like MacKinnon are making room for everyone and producing as well. You can read all the hype that makes it out your way from here, and formulate your own points-based formula for ranking these two since you're just getting a chance to see them, but I've seen just about every home game over the past couple of years (notice the Location: Halifax), and if I want the best "built for NHL playoffs" team possible, I'm picking and developing Jones or MacKinnon over Drouin.
I want a Patrick Kane over a Hall+Seguin type of player.
Not questioning the value of Jones, but he will not immediately come in as a top pairing defenseman on any team looking to compete. Having seen him play, and having seen him in his street clothes, he still has a huge frame to grow into before he can handle that position. Even more than a guy like Tinordi. His impact on the league will not be immediate.
A team like Colorado might throw him into that spot simply because of their current position, but under the hypothetical situation that we had the first pick and took him, IMO he would go back to Portland, or at best play bottom pairing minutes.
He's more physically ready than Doug Hamilton, should be able to play #3-4 minutes right away.