Well, let's consider each one.
RAID 0 - Data is striped across all drives with zero redundancy or parity. You lose any single drive and you can expect to lose 100% of the data.
JBOD - Data is spanned across volumes. Only when the first drive gets full does data start getting saved to the next drive. If you lose one drive, you lose whatever data was saved on it. If it was the first drive in the array, you lose your file/folder structure and can only get files by RAW recovery from the remaining disk(s).
Single Disk Mode - I don't even know what you are referring to. Sounds like this isn't a RAID at all but just an option to use your RAID card to connect a disk independently to the computer.
A better option you might consider is RAID 1 which is a mirror set. That way there is actually two copies of the data and double the chances you get your data back if a drive fails.