VI isn't a parameter I really care much for. I also don't follow the mantra that all VII is bad as some VIIs are very shear stable.
A higher VI is not synonymous with a superior base oil. In fact, it can mean exactly the opposite in some applications. I look at the CCS, KV100, NOACK, and HTHS. The actual composition of the oil is equally as important. An oil that's all homopolymer PAO can have a very VI, but make a terrible engine oil.