Tube amps driving low sensitivity speakers

Given a tube amp rated at 100W/ch tetrode mode versus another rated at 100W/ch triode mode (into the same load), say made by the same company, what sonic differences might result when trying to power relatively inefficient, current-hungry speakers like Magnepans ( < 88dB sensitivity)? Even though the triode would probably "sound better", might there be concerns with its ability to drive such speakers (dynamics, bass control, etc.)?