Well I suppose if you've been playing one for 35 years you might well prefer it. 🙂
I don't get the large tenor thing. It still feels just like a baritone and I don't really notice the weight difference.
Interesting that he should pick out the bottom as being different. Apart from Bb, of course, I don't hear a lot of difference in stuffiness. The only area where the Conn wins, I think, are the palm key notes. They speak more easily and have a tad more guts to them. Mind you, I've always had a few issues with the palm key notes on the Yanag, which were partly cured by opening up the upper octave hole a little. It may still benefit from a bit more - but I'm wary of buggering it up completely.
My favourite bari player at the moment plays the same set up I was using last night - Conn with a Berg. But that wouldn't induce me to change. Each to his own.