Well, @Ryan ORLyou pretty much nailed it. I sell a lot of planes and represent both buyers and sellers. Bonanzas sell well and command a premium, any entry level Piper or Cessna sells quickly (provided its priced reasonably). Some models of Cirrus are very active still (SR-20 is NOT an easy sell right now). All models of Mooney took a 5-20k valuation drop on Vref's last quarter update, depending on the model, and airframe year. I'm talking about a valuation decrease to the BASE price, so engine and airframe hours, avionics, options etc won't change the valuation drop.
Mooneys are a special type of aircraft. Many buyers believe the nonsense of too tight, too difficult to land etc etc but at the end of the day, the active fleet of Mooneys is relatively small in comparison to other aircraft and specialty parts availability is an issue. This is also being reflected in insurance prices for Mooneys. IMO there are some mouthwateringly great deals to be had on Mooneys right now. I just put a client into a stunning 252 for a fraction of the price of any other similarly performing aircraft (and of course, there aren't that many of those lol). Ditto with Ovations, Bravos J's and the short bodies. Look at how much Acclaim prices have dropped recently...
Other models selling slowly right now - Ceesna/Columbia 400/TTX, High performance experimentals like Lancairs, Turbo Saratogas etc. Cherokee 6's are still very popluar due to their unique mission profile but while they are selling, there has certainly been a downward price adjustment. Buyers just arent' buying right now. The COVID boom is 100% over.
From a personal standpoint, it doesnt matter to me becasue I'm not planning on selling my Ovation - greatest plane EVER!!!!