I seem to recall that DG has the larger 5" wheel. I know the
mechanism on both are equally poor and like to fold when they
shouldn't. Not so bad on the DG 300 but earlier designs were prone to
collapse. Same as the LS-4. I think Dirks and Lemke were is same gear
class at the university.
GA

On *FWIW, both
share the same (miserable) landing gear and brake (except I believe
the most recent DG-produced LS8). * So, neither is as forgiving as the
Schleicher designs (for example) in a rough field or hard braking
situation.

My 0.02. *YMMV.

P3