All things being equal, if you have the choice, always go for a solid axle and leaf springs under a trailer, especially one for remote area/arduous terrain use.
It is lighter, stronger, treats the tyres more kindly, has less components to go wrong (such as bushes) and is easier to both upgrade (if necessary) and to get parts for in the bush (...once again if necessary).
This of course assumes the manufacturer has correctly rated the springs to do the job with weight etc; spring rate is FAR more important than suspension architecture/layout
I've never seen a trailer with a steering wheel, or without a hitch, so any reference to 'handling' of a trailer is
HTH