yeah, years ago when i did my only NBU course, the Enterprise course for 3.4, i spent the course using both java and motif gui's (but mainly command line).
As to my preferences - of course command line wins hands down, then motif (well if it was still available after 3.4 that is, then the dreadful java gui. ah well, at least we still got the command line, even Veritas (oops i mean Symantec) can't take away the command line hehe :)