I'm a huge Matthews fan but there was way more hype around JT as a prospect than there is for Matthews.
Saying Matthews ceiling is higher that Tavares', IMO, is just plain wrong. I don't think Tavares' has reached his ceiling and that is while having 2 top 5 finishes in goals, losing out on the Art Ross in the final game, Hart nominations, etc...
As a 15, 16 and 17 year old, Tavares was hyped as the next one. Similar to McDavid hype. Matthews didn't reach close to that.
By draft day, the Tavares hype had died down but Matthews wasn't even the unanimous #1.