It's almost like a brand-specific need at this point.
Two things that comes to my mind:
1.) Whether you like the UI and modes one manufacturer offers over the other
2.) Whether you like the aesthetics of one over the other (looks, color, and output--since the TC20 offers 600 more lumens over the other)
I went with the Lumintop ODF30 because it didn't have that USB port. After it accidentally dropped from a 2-feet height, I'm kinda regretting my decision. It's glitched over