I rank hitch types as follows:
Slide bar: Generally found on lower cost hitches. Can be rather noisy because pin is not held as tight as other hitch types.
Double Jaw: Generally found on mid priced hitches. Quieter and better riding as it holds tighter than the slide bar type.
Single Jaw: Generally found on higher priced hitches. Quietest and better riding since the jaw completely surrounds the pin.
I think all three are safe. The problem I have with the slide jaw is that the bar is straight and the pin is round. That puts contact only on one small part of the pin and bar rather than more evenly distributed for better wear.