Are you looking pellet or ceramic?
The ceramic grills are from Auplex in China. They make Vision and Pit Boss as well as any brand name you want to stick on it.
You can order direct from them with your own choice of options colors and sizes and your own brand if you want. Small orders, or a lot of them if you want to go in business. What you won't get is customer support and warranty.
So, if you are going to pay extra and accept fewer choices you have to consider why?
Vision: they have been in business in the US for the longest and have some unique features. Warranty is a known quantity.
Pit Boss: usually the lowest domestic price and backed by the Costco return policy IF you get the K24 from Costco. Dansens customer service has been mixed, but they have been supporting warranty issues.
Grilla: ????? I don't know enough to answer. There would have to be a compelling case of customer service or local support, but if you live nearby that certainly could be the case for you.
I will say, that after just over a year, the wood shelves and handle on my Pit Boss are starting to look pretty stained and ratty. I can see why they went to the plastic even though when new I thought the black/bamboo combo looked sharp.
Whichever you get, they all cook the same, just like the other ceramic brands.