My signature speaks for my experience.
The 348 gets me into a special group of Ferrari Stooges that own and work on them all the time. There is not a single problem on a 348 that has not happened to someone before and a solution always exists. Parts are available still with some much improved after market.
The 355 will have more issues to deal with. The 360 will have fewer issues to deal with but it is not an inspirational analog feel. The 308/328 is the easiest to own, with some quirks of their own.
On the scale of desirability for a 348, this is the generally accepted list:
348 Factory Challenge
348 Serie Speciale
348 Spider
348 TB/TS
later years are better than earlier years.
Good luck. There are several Auzzy 348 owners that are very good with their tools. Look them up.