It isn't just that Musil developed a scoring touch, there were some weeks last season where he was hands down our best performing prospect, even in the midst of Kyrou's scoring streak. Maybe that's easier to do as a 19 year old playing against 17 and 18 year olds, but regardless, I came away very impressed with him both on the scoresheet and in my couple of viewings. He's big, he's a nasty brand of physical, a great net-front presence, he has a decent shot, and his skating is good enough to lead breakouts. There's a reason that coach Sutter named him captain last year. And then, he comes in to Chicago and was, imo, the MVP of the opening series, potting 5 points in 6 games (which were numbers 2-8 of his pro career). I watch Musil and I see a lot of Reaves' game last year, except that Musil's game is already in that style and he doesn't really have to make a ton of adjustments or re-learn the game, just develop. With that in mind, I can very easily see Musil being a cornerstone 4th line player like Reaves was. I'm excited about him.
For Poganski, all of those things might also be true, but like I said, out of sight out of mind. I don't think we have a Parayko situation on our hands where he'll come in next year and be a diamond in the rough. I do think that he'll be on par with Mackenzie MacEachern, in which case it's nothing to get too excited about. MacMac was a slightly better player than Pogs at the same age, and his first year in the pros was just a little better than bad.
So that's the difference between the two/three players for me.