The Clio has very comfortable seats, easily the equal of the Alfa, and the ride is more pliant than an Alfa with 17s on, but similar if it has 16s.
The interior quality of the Alfa 147 is streets ahead, but the switchgear, gearbox, throttle, suspension etc feels a lot better put together in the Clio if that makes sense. The Alfa always felt like a leggy car even when I bought it on 8,000 miles, the Clio feels much better put together in the drivetrain department.
The Clio chassis is also way ahead, the traction systems come on a lot earlier in the Alfa, but the Clio system only stops play when you really need it, so hardly ever! I drove a 147 GTA recently and it was awful, everytime I tried to have fun "Computer Says No!".
My only worry for you is the wind noise and rattles, but its solid on motorways and it feels as steady as the Alfa at 130mph, and will go 10mph higher if you want to!
Id say go for it, I certainly havent looked back!