Bordeaux chateau vs hotel.

My wife and I are planning our summer trip for mid July and were debating Bordeaux or Piemonte and leaning toward the former.
Last time I went I stayed at Chateau Cordeillan-Bages in 2008 and really enjoyed it and made by own appointments. I was thinking about going the same route and perhaps spend several nights in Saint Emilion as well in say Plaisance. I’ve noticed that a lot more chateaus are available for guests to stay at like Troplong, Pape Clement, Beychevelle, Valandraud. Does anyone have any suggestions either way.

Also looking for chateau recs and whether a guide is worth the price. I think I used someone for a day last trip and remember it being expensive without adding much. Is there one in particular who can assist in getting into the top growth chateaus? Any other infor would be appreciated.

Thanks Howard. Very helpful.