From a data safety point of view, I would say RAID0 is worse than no RAID. RAID0 splits data across multiple drives, which tends to improve performance, but means that a single drive failure takes out everything, so now only one piece of hardware needs to fail to screw you completely.
RAID1 mirrors one disk to the other, so if one disk fails, you still have the mirror on the other disk. So with two drives, I would say you should use RAID1 for data security.