Still Life is easily Opeth's most complex work, and Mikael has even alluded to this himself during concerts (Royal Albert Hall comes to mind). Songs like The Moor and White Cluster are relatively simple compared to Godhead's Lament, Moonlapse Vertigo, and Serenity Painted Death. Mikael has stated that he doesn't like how Moonlapse sounds live because of all the guitar parts; in fact, I believe it was only played on the Still Life tour.
Face of Melinda is a live staple because of its smooth jazz first half and dynamic conclusion, although White Cluster (which is one of my least favorites from the album) seems to be played just as often.