I've had Impossible from Red Robin and Burger King, which both grill their burgers, and have found them to be pretty darn indistinguishable, and I'm a big time burger fan.

The Beyond I find to be very distinct. I haven't been around "raw" Impossible patties, but I've made the Beyonds at home a number of times. They smell like cat food to me before they're cooked up, but I absolutely love the flavor of them so much! They have this vegetal background taste, but whatever it is, it tickles my taste buds in a very pleasant way for someone not usually the biggest veggie fan. I could see people not liking it, but I get periodic cravings for it now, since it is such a distinct flavor that nothing else matches.

I should also start using a charcoal grill rather than propane. Would probably give them a better flavor.

We use charcoal and it's pretty darn good. We prefer to cook them until there's a 'crispy' texture on the outside, my SO doesn't enjoy softer textures and figured out a way to carefully cook them to have a bit of char. They feel even closer to beef like this to us.

I've also experimented with a griddle by smashing them thin too. Results were promising, I just haven't quite got it down yet though

I personally prefer the Impossible meat, it feels a lot more like beef than Beyond. Not to say Beyond isn't great too though