I’d have another GTV I think, granted mine was only a 2.0 TSpark and I only had it for a month or so, but it was a lovely place to sit and even the 2.0 made a great sound.
It's a very different proposition to an MX5 though. One is a sharp handling, rear wheel drive convertible, and one is a bit of a cruiser coupé that values looks (and sound) over driveability and reliability. I'm not sure you should be considering both in the same vein.
I'd also very much like a Giulia Quadrifoglio, but definitely not brand new as I'm expecting the depreciation to be horrendous!