My guy feeling tells met OTG is the way to go, however, since I put my Spark in FCC mode, I haven’t had any glitch disconnects and my experience is the same as yours; flying non OTG is just so quick and easy that I don’t bother putting the cable in anymore. However, if you do feel insecure about flyaways and video streaming reliabitu, OTG could help you.
Yes, it isn't a black-or-white only subject, and that was my point.
I use otg cable when I need it, but wireless is easier and more convenient.
If your smartphone is 5.8g capable, or you have no disconnection problems flying in 5.8g (as in FCC mode), you don't need an otg cable.
Cable connection are not always"better" than wireless one. It depends on the streaming bandwidth we want, the number of simultaneous connections, the ease of use, the flexibility and portability, etc. In everyday life, most of us, use more wireless services than wired.
Use otg with care. Make sure that it IS an otg special cable, and remember that it has polarity. You cannot exchange cable's edges, between controller and smartphone.
If you're in CE area, check FCC mode, before buying an otg cable.