I have no technical experience or knowledge.
However i have an Astra Turbo and from new i used Shell Optimax all the time everytime (someone else swore by it) although about 6 months ago i noticed that it was making noises when i accelertated and was running a bit rough i thought it was a bad batch of fuel so i ran another couple of tanks and it didnt get any better. I then decided to try another brand of fuel (BP Ultimate) and i found that the car is running alot smoother and not making the noise on cold acceleration.
As i said i am no expert it is just what happened in my instance.
I have not tried the vortex but people have told me that its good fuel.
I couldnt tell you which petrol gave you more performance i think that it would be mi nute (spelling ops: ) I think it would be trial and error on what your car likes and how you think it performs. If everyone agreed on which fuel was best everyone would use the same brand. I think its more personal opinion
Dont think ive helped much sorry ops: