I don't own either, but I'm seriously considering getting an E03. The metal body appeals to me, the mode spacings fit what I like, and it can be used very handily as a hand-held angle light, especially with the tail magnet.
5000K or similar color temperature is partially a matter of preference, and partially a matter of what other light sources you may be around that might make it seem neutral or off-toned. However, 5000K is a very good choice for most situations, I think including what you're describing.
High color rendering index (CRI) is the feature I think is most important if you want good discrimination of the colors in the rocks you're inspecting, and that's a spec that the Nichia 219C is very good at - the particular 219C used in the E03 should have a CRI score of 90 or higher (out of a possible 100), where as most headlamps score in the 70's, and most household LED bulbs are in the 80's.
So I think you made a good choice, both on the light and on your batteries.