I don't know about the ones that are meat-like - that is never my goal (and impossible burgers seem too fatty for my tastes). But I can make something good tasting at home - one of the better ones has brown rice and chickpeas as the main ingredients.

I'm going to guess McDonald's veggie burgers will have a decent amount of processing: I don't know how that compares to processing hamburger patties. We are, after all, comparing hamburger patties to pucks of veggie material instead of veggie burgers vs steak.