Some cars are better built/engineered than others but it's how they are used and looked after that ultimately determines how reliable they are.
I must add rather than edit, I've never owned a Renault only worked on the 2 mentioned.
AAAAAAAAGGGHHH ME HEEDIf you would like to get more involved you can always join the club http://www.renaultownersclub.com/paypal.shtml
Bob