What I should buy : Azimut 53 2021 VS Azimut 60

generally speaking there should be minimal differences in maintenance between a 53 and a 60 footer. Both will have similar systems like two engines and running gear, a gen, similar electronics, air con etc. if anything maintenance on a bigger boat is easier therefore cheaper due to better access.

the only difference is what gets billed by the door like diver and haul out

I find that the type of equipment installed has a bigger impact on maintenance costs than the size of the boat within 15/18 feet difference.

for instance, the bigger boat may have chillers vs splits… chiller are much more reliable. Engine brands and models, like Cats vs MTU vs Man vs Volvo and that is also location dependent. If you don’t have a good Volvo or Man shop close to where you are based, you costs on these will go up.

How were your experiences with the 48? Same marina and facilites with the next boat as current?

Id agree. All things considered, the 53 may just not have as many examples sold and then on the market. If the price was close, many owners may have just went with the 60. See where your desire takes you, and rely on the survey.

I know nothing about either of the boats in question. However, fewer of a certain model boat being on the used market could also mean that model is preferred and owner's simply don't sell them very often. Or when they do consider selling, they get snatched up without hitting the open market. This is often the case with higher end, desirable sportfish boats. Maybe that's why you don't see many of the 53's for sale?

You need to talk to owners of these boats. Ask Azimut how many of each they produced and get the higher volume boat. In my case, a much older boat, Riva produced a 42, 45, 48 and 50 foot versions. The 42 was too short, the 48 was considered a good balance and the 50 was considered too long, wet and prone to purpoising. So, I got lucky to find a 48.