I definitely was drawn to trying out DarkBasic Pro because of their rich set of add-ins available at a relatively reasonable price, as well as the huge community, and availability of lots of 3rd-party tools at very low prices (or free!).
TGE is much more biased to a 3D FPS-type game, whereas DBPro starts you with a clean slate and lets you go in any direction you want. On the other hand, if you DO want to do a 3D FPS game, then the one you create with TGE will probably end up running faster than similar one created using DBPro. TGE's using TorqueScript and C++ instead of a dialect of Basic can be either a plus or a minus depending on your preferences.
Oh, and if you want to use shaders then you have to get TGE
and TSE (Torque Shader Engine), which will run you $300. Shader support just comes with DBPro.
In the end, its having shader support, as well as seeing Dark Physics in action finally gave me the push to purchase that, DBPro, and a half dozen other add-ons a few days ago, and I'm having a blast so far.
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Regard all phenomena as dreams.