Lanbers were probably the most popular entry level clay guns in the UK for several years and had a good reputation for reliability. There are a couple of Rizzinis - E.Rizzini and B.Rizzini. One used to build inexpensive guns but have gone a little upmarket now and the other is rather more expensive. Both look pretty much like Berettas to me....like most Italian guns. I don`t think that there is a poor Italian O/U produced nowadays and their quality/reliabilty can almost be taken for granted.
Either gun should have a decent guarantee so it really comes down to personal taste - and I`ll bet the Rizzini looks prettier.......