I don't watch Kimmel at night but I usually catch his opening monologue on YouTube in the morning.
His regular trashing of Trump is always super entertaining.
It's hilarious to see Trump constantly "tweet" about him unable to control himself.
He still talks about Kimmel's jokes he told at the Oscars 7 months ago.
But apart from that I think Kimmel is the best of the late night hosts.
He may have jokes written for him, but his delivery is excellent -- and his interviews when I do watch them are reminiscent of Carson, asking real human interest questions, not just hyping their latest projects, movies etc.
I put Colbert in second place, but I get annoyed at how he can't just do a joke and move on. He has to keep milking it and overindulging in it.
Fallon I liked at first, but I was put off by the stories of his alcoholism and abuse of staff when he's drunk.
He had admitted his behaviour but I don't know whether he's stopped.