OK. The J&J designs all followed the same basic recipe and were constantly being changed because the market up to around 2009 was huge, particularly for charter use. Bavaria were building more than 2000 boats a year and were revising the models every 2 or 3 years. Each time (in my view) it was two steps forward and one step back - that is they would improve some aspects and spoil others. However the basic underlying qualities stayed the same. Inevitably some specific models really "hit the spot" such as the early 42, 32, 34, 38, 46 and later 36. None of the others were "bad", but in my view after 2007/8 they started to lose their way, particularly with interior design compared with earlier boats and compared with the competition.
Much of this is subjective, but I think it is fair to say that most people have their "favourites" - often the boat they own, or lust after. Personally I think the Ocean range like Yngmar has is the pinnacle of the Bavaria J&J boats, but it is rather different from the more common cruiser models once you get past the visual similarities, although the Cruiser 42 of the same era runs it close. That was my first choice when we bought our first Bavaria, but it was just a bit too big for what we wanted and we bought a 37 with a shallow keel so we could transit the French canals. For what we wanted it was excellent and kept it 13 years before swapping for a 33 in 2015.
Not sure any of this helps. Boats are what they are and by and large owners are happy with their choice. You can only buy one boat at a time and your choice is based on what you perceive as the best value for you at the time. It will never be perfect and next time you buy you will no doubt seek to buy a boat that is "better" based on your experience or your changing circumstances.