I might be wrong but the 16V Fiat engine also suffers cam belt issues. In fact the Lancia Integrale Owners reckon it should be changed every 24k miles.

It is thinner in section than the TS belt.
That's interesting as I've heard almost the opposite to that. In that the 16v cambelt *should* be changed at it's correct service time, (clearly). But the 20v has a couple of issues where the cambelt cover could potentially foul against the belt and cause failure. Particularly if the belt cover has been bent to get to the belt, without proper removal of the cover.
That said, the most frequent causes of cambelt failure on both the 20v & 16v are (a) A worn belt, that has not been changed in time, or (b) failure of one of the other auxillary belts, which can take the cambelt with it.
Cambelt failure is not a frequent issue on these cars though, unless they've not been properly serviced, with on time belt changes.
On the subject of choice between a 16v/20v Coupe or the Alfa GTV. I don't think there's much in it in terms of reliability, styling, comfort, etc. You'll be buying a relatively old car now. Both *may* have some reliability issues, not neccessarily because they are unreliable cars, but because of the ages. In terms of styling, that's just personal preference. Some people prefer the more "conservative" styling of the GTV, others (like me) love the 90's 'Ferrari-esq' styling of the Coupe. Comfort is going to be similar on both models. Some say the Alfa has a better suspension setup, others say the Coupe communicates much better than the Alfa. So again it's personal preference with this.
Practicality, both the GTV & Coupe are coupes, so there not going to be as practical as your current car. But both are fairly practical for a Coupe styled car. The Coupe can fit four adults, rear legroom is a little restricted, but it's not as bad as you'd think. Rear headroom can be limited, if you're over 6ft. In the Alfa, rear legroom is poor, and really you'd be kidding yourself if you think you could get four adults in the GTV. Two adults upfront, and a couple of kids in the rear might be okay though.
Lastly, costs. Again both will be more to insure than a JTD Stilo. But this depends on your location and age. I'm 35, live just outside of Harlow in Essex. And I'm paying £470 per year for both the Coupe, and the Bravo on a multi-car policy. If you're younger, and have more points, or live in a higher risk area you'll be paying through the nose for either a GTV or Coupe. Fuel is going to be a massive change for you too. The 16v 2.0 engine has a habit of being a thirsty bugger. This is where the GTV may win, as these are slightly better in terms of fuel economy. That said, either one will appear to guzzle fuel compared to the JTD Stilo.
After all of that. It sounds like I'm trying to put you off this idea. I'm not - promise!
Both the GTV & Coupe are thoroughly rewarding cars to own and drive, they're both rapid, and look stunning on the road when clean and polished.
Good luck.
