Never liked Sinclair on Babylon 5, but Sheridan was tolerable.
I LOVED Sinclair. Thought Michael O'Hare bought a real gravitas to the show. Boxleitner's opening narration was amateurish compared to O'Hare's moody first season intro. Also preferred Sinclair's Battle of the Line backstory and eventual fate as Valen. A really distinct, memorable character arc.
One of my favourite lead characters in a TV show. Sheridan was good too but a bit too chipper for me. O'Hare is exactly the type I'd expect to be commanding a space station. Sorely missed and underrated actor.