I've (for the first time) secured 2 round trip business class award tix SFO-SGN for next June. Upon reviewing the itinerary from United, I see a "Connoisseur" class where the class code normally appear. What is it?

Also, the outbound is on ANA 777, what're the best seats?
Returning is on SQ 747.
BTW, I have to call both SQ and ANA for seat assignment? Not that I mind, just wondering...