I think this impression comes about because people here tend to compare the respective agencies' "intro" classes--Fundamentals and Essentials. But what gets lost is the idea that these two classes aren't an apples-to-apples comparison. Essentials was designed to be something like a half-step before Fundies, and used to be marketed as a "pre-Fundies" or Fundies prep class that was accessible to nearly anyone curious with the system but unable/unwilling to make the investment in gear, time or energy required to fully take advantage.
As such, UTD's Intro to Tech class, the closer equivalent of Fundies and a half-step above it, actually has more rigid equipment configurations than Fundies - ITT actually requires doubles and a stage cylinder (but apparently a can light is optional).
In the end, as you progress up the chain in both agencies, the equipment configurations become more "tyrannical," or standardized, for both. With GUE, your simply don't have the option of starting at a more "introductory" level as with UTD.
If you look at the new open water certification classes, you can make the argument that UTD is less strict, as the equipment requirements are closer to what Essentials requires whereas GUE's is closer to what Fundies requires. So it seems the equipment "floor" starts higher on the GUE side. But they even out quite rapidly.