iTunes Restore is to restore the iPhone/iPad/iPod to factory settings. It also can be used to repair iOS but comes with a high failure rate, data loss, and more issues.
ReiBoot Repair, mainly focuses on fixing all iOS system errors. It has three repair modes with a higher success rate and fully compatible with any iOS device. Moreover, ReiBoot is simply unmatched in terms of speed and reliability and offers many more features than iTunes. When you use Standard Mode on ReiBoot to repair stuck on black screen or other issues, it won’t cause any data loss.