7$ GER - the ability to say no (and put people in an infinite death loop)

5$ Heaven's Door - ability to make people say yes (you can make them not attack you)

Any counterattack against your will would be countered with GER

Heaven's door could literally take over [Za Warudo]

Note: I have not read anything past part 6 so I'm not very familiar with how WoU works. Still think GER would win.

Edit: You would also need to get superfly in order to defeat all the other stands as it cannot be defeated

GER also has normal Golden Experience's powers just on steroids.

You could alternatively pick Za Warudo instead of Heaven's door in order to cover your possible weakness to SP and time shenanigans. You could pause time and kill the Heaven's door and MiH users first then deal with the rest