Hi. Just with a small doubt.
I have been doing some research on Ferraris I would be intrested on buying and have noticed that most of the times I find 328 that are as expensive as a 348. How can that be?
As Stradale mentioned, the 328 has aged much better than the 348. Suggest you drive both and see which you prefer. The 308-328 series is regarded as "classic" and highly successful. The 348 is much more controversial and its Testarossa type styling has not aged as well.
The Mondial Ts are known to suffer from the same ailments as the 348. They share the same drive train and electronics. The 355 is often thought to be as reliable as the 328. Some would say more, some less. Both are good solid cars. Both could be considered a good daily driver.