I have a Blackstone Griddle. I don’t know that the brand matters that much, but I wouldn’t go back to a regular outdoor propane grill instead of the griddle. I do occasionally use a charcoal grill if I really want that smoke flavor.
What I can cook outdoors though is greatly expanded. Basically you have the same type of griddle used in most restaurants to cook most everything. Fish, Veggies, Stir Fry, Cheesesteaks. Bacon, Eggs, etc. it can also do a real nice job on steaks and burgers. I do sometimes use charcoal for those though.
I have tried those griddle tops for grills before, it was never as nice as the dedicated Blackstone.