Trump is good if you want to learn the basics of HS. I watched him a lot early on, and will say he helped me become much better in Arena. If you want to learn about things like card value, efficient trading, building a curve, etc. Trump's the guy to watch.
He's nowhere near the upper echelon of players. I don't think he's ever even finished top 10 in a ladder season(correct me if I'm wrong). He hasn't come close to winning any major tournaments unless you count the super early ESL days around 2013/2014 when there were only like 5 pro players.
There are waaay better players out there to watch and that has reflected on his Twitch viewership. He used to be in the 20k+ range but now he's in the 5-7k ish range. He's amusing but not as entertaining as others, he's a decent player but nowhere near as good as others.