[mlin]

I have run both of these ROMs quite a bit and both are included in my in depth, objective ROM analysis (see the link in my sig, updates coming very soon). From my experience, they are both incredibly stable. However, I prefer MR to NRG for 3 reasons:
1) MR has a stock appearance which I like very much.
2) MR has better battery life
3) MR is a much lighter build yielding more available RAM and room to install prorams of my choice.

Hope this helps.