In My opinion OC With software isn't at stable as with the bios, IF the software crashes for whatever reason, there goes your system, BSOD like crazy leading you into thinking the OC wasn't stable. While OCing with bios isn't hard and if your system blue screens then your gonna have to change something in bios like More Vcore.
Only time I use OC software the came with my ASRock board is to test higher OC's but even then its weird how it works. On the AXTU (ASRock Extreme Tuning Utility) I can get my 1100T to 4.3ghz vary stable it seems, but I OC with bios, its not stable. 4.2ghz is.