No, the trailers here State's Side are not all the same.
Burley was the company that first received widespread distribution, and many other companies followed, but with lesser build quality and cheaper prices. I suspect the key details to look into are the hitch mechanism, the wheels, the general design ease. Also, consider expandablilty. Some people like the trailer to double as a jogger (or walk behind). Burley seems to have set a standard with these points. All this said, It's been about 8 years since I've been in the market.
Best of luck