Read the ‘trailer science’ section on the carryfreedom site. The choice really is between 2 wheel trailers and 1 wheel trailers. 2 wheels are much more efficient than 1 wheel trailers. One wheel trailers handle better off road but you’ve only really got a fraction of the benefit of using a trailer, as although the weight sits on trailer its is still being balanced by the rider and a surprising amount of effort goes into that. A two wheel trailer doesn’t influence the balance of the bike and you can pretty much forget that its there. You can carry more for the same rider input with a 2 wheel trailer.
Where I’ve really found 2 wheel trailers to benefit is when they are off the bike – if you are using trains and planes to get to and fro from your ride then 2 wheel trailers can be wheeled around like a cart, keeping one hand free to handle bikes or bags or whatever. Single wheel trailers are more of a handful.