RAID 1+0 (or 10) is a mirrored data set (RAID 1) which is then striped (RAID 0), hence the "1+0" name. A RAID 1+0 array requires a minimum of four drives – two mirrored drives to hold half of the striped data, plus another two mirrored for the other half of the data. In short raid 10 should be used and has less to do with speed but more about storage and data security
RAID10 should be twice faster in writes to RAID1, due to striping. Faster reads too.
And RAID10 can handle n(where n is number of mirrors in RAID10) hard drive failures, as long as one of the drives in any mirror is functional. If you loose two drives in a single mirror, then you loose data.