The Eichel homers just love to harp on this false notion that having slightly more physically mature players somehow makes the NCAA a better development league than the CHL. Which is clearly not true when you look at the results -- elite players have come out of both systems, but arguably disproportionately more high end talent has come from the CHL and its predecessors, including some of the best American players like Lafontaine, Kane, Modano, as well as generational talents like Orr, Gretzky, Lemieux, Crosby, McDavid.
Fact of the matter is that the CHL has more exceptional talent by simple virtue of the fact players start there two younger usually. Superstars like Eichel typically only play a single year in the NCAA, maybe two in some cases (Toews), or if they have an early birthday will be drafted straight out of the NTDP. Connor McDavid has played in the CHL for three years, and at the low end you have Stamkos playing two, but pretty much every star player plays at least that many.
Eichel mostly plays with a bunch of scrubs who will never make the NHL. McDavid plays with Strome, who will be one of the top picks in this draft, and DeBrincat who is looking like a high pick in 2016. Eichel is getting experience playing with a bunch of low skilled grinders, while McDavid is getting experience playing with creative players who can think the game at a similar level to guys like Hall and Eberle who he'll be playing with in the NHL. *That* is why the CHL is a superior development league -- it emphasizes hockey IQ while the NCAA emphasizes physical skills.
Smart move by Matthews if he bypasses the NCAA and/or the CHL in favor of playing with more talented players. It will be better for his development. I think he's going to be significantly better than Eichel, maybe as good as McDavid.