When I lived in France, I had a 106GTi that a friend lent me for a while when she broke her collar bone.
As far as fun and performance goes there is no competition; the Pug wins hands down.
But it depends what you want... the Clio is more spacious, has a higher driving position, has more luxury, and is probably a lower insurance group.
If I had to choose between a 106GTi and a Mark 2 Clio1600, I would be spoilt for choice, but would probably choose the Pug, for the same reason I chose the Cup over the standard 172... FUN! Nothing truly exciting is without danger after all!
Insurance - try Peugeot Insurance; Tesco; Adrian Flux....
Insurance will probably be more - even if it is the same insurance group - because GTi means faster than 1.6 16V, in an insurance salesmans eyes. Whatever, tho at 18/19/20 years old, you will pay a LOT.
Good luck!