there are several differences in the 2 boats but both should suit you well...

the hobies have curved hulls and handle surf very well...
I THINK the 5.2 doesn't have curved hulls but i dont know about its ability to sail through surf/waves

i have heard (never sailed one) the 5.2 is heavier, and the mast in much heavier (harder to step)...

since there are so many hobie's there are usually more parts available (or at least easier to find)