Right now I would buy IGR before RNP, but they are very similar.
IGR has a lower expense ratio, higher (and riskier) dividend, better discount from NAV (slightly suspect), shorter history, and a little lower debt ratio.
Morningstar rates IGR higher, for what that's worth.
I have both for some intra-junque diversification, but as your question implies, you would not want to bet the farm on either. Two pieces of crappola that will look great if they get half way back to their 2007 highs by 2010. Both are high risk/reward situations IMHO.