I've never tried Miracle Whip. I remember when I was a kid, seeing it advertised on TV, and asking my mother about it, and she got sort of irritated and said it was a waste of money. That said, she was extremely sparing with the real mayo. I don't recall her ever using it on sandwiches, but I guess she used it in tuna salad.
I happen to love real mayo. Especially after reading Adelle Davis in the 70's; she enthused about how much healthier mayo was than margarine or butter. Well, she was right about the margarine. As was Julia Child.
I have made mayo. It's not difficult if you have a blender or Cuisinart. That little hole in the bottom of the Cuisinart food processor pusher is for dribbling oil in at the correct rate.
I studied nutrition for a while at Cal and the fears about mayo being unsafe are largely unfounded. The acid (vinegar) in mayo is bacteriostatic. It actually helps keep foods mayo is mixed with stay safe longer. Of course if you mix spoiled tuna or chicken in with mayo, the mayo won't kill what's already there. Same with making mayo from spoiled eggs. I figure the stuff on the shelf in the store is pasteurized and as safe as any.
Mayo on fries... can't say I've tried it or want to. Sounds a bit like poutine, lol.
Oh, and Best Foods here is more or less the gold standard. Recently I read a review, Consumer Reports, I think, and Costco's house brand mayo came in equal rating with Best Foods. I get the Costco version because I like the jar shape better.