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Maraglo is a specially treated and specially applied version of Luminova - a specially formulated photphosphor (light excites its molecules to emit photons, ie. light, instead of radioactive particles). It is generally regarded as the best of the non-tritium materials in terms of its combined brightness and the persistence of its luminosity after light exposure. Most people cite the figure "10 times as bright" when comparing Luminova to conventional phosphors. In fact when you consider brightness after several hours it is even better than that, and Maraglo is superior to regular Luminova. It's advantages compared with tritium are:
it should (if protected from, excessive heat, UV light and water) have a longer useful life than tritium systems;
it is non-radioactive, and, therefore can be used in more environments, and without any fear of radiation exposure (although tritium is also generally regarded as safe if kept in the watch),and,
for a time just after it is recharged by exposure to light, it is brighter than even tritium gas vials (this superior brightness, however, is lost after something like an hour or two (depending on a lot of factors).