GPU OC software with highest stability?

[XiandreX]

I used to use MSI AB but had some stability issues when overclocking and I switched to OC Guru and the issues went away. The solution it seems was to increase the negative volt offset. At that time I do not think AB had such an option whereas OC Guru does.

However I am curious as to what other options are out there.
OC Guru (at least my version) is rather clunky.

Running the GTX 970 in my sig.