I tend to stick to use v power the most as I have a shell garage just down the road. Though if i'm feeling tight i'll run it on tesco 99, especially if i happen to be at tesco's at the time (8 mile round trip to get the stuff) and they're doing a 5p off deal.
Prices are in free fall atm which is great, i've found getting to know the guys at shell is useful. v-power has a tendency to go off the older it gets (looses its aromatics) some of the guys at my local shell if they see me coming will but the newest tank on for me
having a jdm scoob thats mapped to 100, its very sensitive to which fuel your running, particularly on a cold start. I once run it on esso super I think and it didn't like idling