Go try out in shops, if you are getting a camera with 3X zoom and 7~8MP, MJU series is noticeably better in terms of built quality (metal vs plastic body), better high res LCD screen, speed of operation, faster shutter lag, weatherproof, etc but no manual functions, no viewfinder, etc. So it really depends on what you are looking for in a camera.
Also, if you can, wait for the MJU 750... it is quite a killer pocket camera... solid metal body available in 4 colours, 5X zoom, ISO1600, CCD shift anti-shake system built in, fantastic 2.5" LCD, etc.