I only have experience with Type B, using stainless crimp connectors.
I chose the stainless connectors based on ease of use. Copper compression ring tools need greater spacial access and periodical calibration.
Direct burial is OK. Warnings for UV exposure are probably a bit conservative. I've had a temporary exposed water line run at my cabin in Sterling for 2 years with 100% exposure and so far no issues. I wouldn't want to do it for permanent run, but it works for now. Flushing toilets keep others happy!
Type A is technically superior, but both are very good. If using a contractor that has the expansion tool for Type A, that would be my preference. If doing the work myself I would chose Type B based primarily on the cost of the connection tool. Assuming buying tools. If rental is available then a toss up and run the numbers.
