The UO Outlands staff have done an incredible job of balancing end game templates here. Both of those templates can easily haul in the gold. Dexer, Bard, Tamer and Mage are all pretty evenly balanced and which one happens to be slightly on top (regarding GPH) really depends on what was patched most recently.
Try to look into other differences each template has to offer and determine which is more important to you. GPH is not a good indicator of which template to play unless you want to chase FOTM templates ever patch. In which case, no one knows how this taming/summoner overhaul is going to land, so to answer the FOTM question we need to wait a little bit longer.