First, use the drive with original firmware for few days and few burns, just to make sure it is in good condition and while you start learning the backup process.
Each newer firmware has enhancement over the original one you got with the drive. This is true for official updates you get from the manufacturer. Unofficial firmware have enhancements and modifications. It all depends what you need and what you want.
Normally, if you want to overspeed, overburn, bitsetting, remove region control, add more media selection, change writing strategy, remove riplock, etc, you go find unofficial firmware.