This is my preference and experience.
1. BP Ultimate - Engine is noticeably more responsive and smoother
2. Shell V-Power - Engine is smoother and a tad more responsive
3. Texaco Standard 95 Ron - Engine seems more responsive
4. Tesco 99 Ron - Same as Texaco Standard 95 Ron
But I tend to stick with V-power most of the time because it's cheaper than BP ultimate, it's got cleaning properties and there's a shell near me. If BP ultimate was the same price as V-power with a garage near me, I would use them all the time. My EP3 just seems to like that stuff more imo.
Does anyone know if v-power is just optimax relabelled, i.e. they didn't change anything at all?