The Saudi aircraft are not currently flying a great deal, its a pilotage/manpower/training technique issue rather than one relating to the airframe. I understand training of the local would be pilots has not gone particularly well.
TAMS has been off the radar for a year now.
I may have missed it but I do not think the 434 is yet civil certified but the Saudi's do not need that. There are a few operators of the 333 but it is not in widespread use. That puts you at the [not so difficult] decision point of tried and tested or unproven.