Well I have had both, Valver was always in the garage every month come pay day something was wrong, alternator, radiator, won;t start, battery, big end the list was endless.
Other side of the coin my Willy 3 has never been into the garage for anything other than a service and errr thats it I think, oh an ABS ring too.
Dont think its anythign to do with it being a Williams or a Valver, I think my first one was uncared for and the Willy was FRSH and runs sweet as a nut, come to think of it my 16v had a FRSH, hmm got me worrying now...lol