Len wrote:
Important criterium for us is llifespan, in other words:UV-resistance.
....
Another criterium : suited for scuba diving from the rib.
Joker 315 weighs 53 kg. No problem to get aboard with bottle removed
and floating. African Cats 335 weighs 24 kg (nice for the davits) but
won't this low weight become a nuisance when climbing in from the
side?

Most RIBs are very stable and lighter is better in every way. Larger
boats like the ones you are looking at will have bigger tubes which
make for a drier running boat but do make it harder to get board from
the water. Haplon should come with a 10 year warranty, PVC boats that
don't have covers last about 5 years in the tropics but can last
indefinitely with good covers or paint. I'd suggest looking at Aquapro
and Force (New Zealand companies w/Chinese manufacture). Give some
thought to how you will store the RIB, too.

-- Tom.