In general, I prefer sativa effects to indica effects. However, I would much rather get a variety of different strains at different times than always some strong sativa. The very best strains, in my opinion, tend to be sativa/indica hybrids, favouring the sativa. Think AK.

To respond to above posters - yes, indica contains more of the chemicals that cause the more medicinal effects of cannabis - pain relief and increased appetite are the first two that come to mind. Medical pot tends to be indica. Sativa tends to have more THC; thus the headier high and less pronounced body effects.