I have used BP Ultimate until recently though Shell VPower has been rated highly especially Honest John of Telegraph, Recently when filling up my lawn mower I noticed it smelt slightly differently to the smell I am accustomed to so I guessed this was due to ethanol being used. Coupled to the fact that ethanol content is going to go up to 10% from September I started looking into what else I can use. Esso Supreme 99+ seems to tick all the boxes for me as they say it does not currently have any ethanol in Supreme 99+ (but it may change from September) except if you happen to live in Devon or Cornwall.
I have changed in my daily use car and it appeared to have more power. I haven't used in my Ford so can't comment.