Not really, no. They're pretty comparable, both being entry level hydraulic options from both companies. Both actually take the same brake pad (the Kool Stop KS-D620 as an example). I've personally owned both; my Giant ARX had the Tektros and my Giant Roam has the Shimanos. The Shimano brake levers themselves seem a little nicer to me (a little more compact maybe), the Tektro calipers use a bolt to retain the pads vs. a cotter pin with Shimano. Shimano uses a cotter pin in nearly every brake caliper until you get really high up in the line, where they exchange the pin for a bolt. All it does is keep the pad spring and pads from falling out, so it probably makes absolutely zero difference in practice. I could tell no difference in braking performance. My dad's Trek DS has Tektro HDC-300 brakes (similar to the current HD-M285) and his e-bike has Tektro Aurigas (which I think are HD-M290 or something like that). They all seem to work about the same.

I think it's no different from derailers or other parts -- lower grade stuff is just as durable, and generally works just as well, but the penalty (in exchange for a lower price) is higher weight and/or worse cosmetics.