Have been almost completly vegetarian for the last 4 and a half years and was pretty much a carnivore before that, so I feel this is as unbiased of an opinion as is possible.
The Beyond, Gardien, Impossible, etc fake chicken have more flavor, nearly indistinguishable texture, are just as juicy, and aren’t greasy. At this point, I consider them better than regular chicken with the sole exception of fried chicken which was never my favorite but I can see the appeal of it.
I’ll concede that the beef substitutes have a ways to go (I like them and they’re not bad but they’re not fooling anyone, either) but they’re not the subject of this opinion.
Quorn is the best I’ve had. I don’t think it’s quite as tasty as real chicken, but it’s close enough for plenty of uses. It’s a touch dry. It has very good verisimilitude to slightly overcooked chicken.
I find Gardien’s beef crumbles to be equally enjoyable as beef for chili and tacos and overall better when considering convenience, putting aside the ethical argument.