IMO. You're out thinking the problem. There is no way theres a measurable difference in handling between two different brands of the same weight fork oil.
It's oil, and HD oil is just re-branded from another MFG. They don't refine it themselves Heck, The forks are made by Showa...
Any high quality fork oil in the weight you need will be fine. If you are near the end of the suspension adjustments that you like, get a lighter or heavier oil. Otherwise stock (I believe 5w) will be fine.
I currently weigh 220lbs geared up, so I typically use 7.5w and have used 10w with success when it's super hot or I'm beating it at a track day.