What's better?

I agree with (Admiral) Tedolph.  If you are an amateur photog, which seems to be the case, and don't need blazing focusing speed you'd do well to get an E-PL1.  They're insanely cheap now (US $140 new body) and will give you 99% (OkK 98%) of the IQ of any other PEN, probably including the OM-D if shot at ISO 800 and below.  Get the E-PL1 body and then focus on putting good glass on it, not the kit zoom.  Oly and Panasonic have some great primes out there depending on what FOV you favor.