I say this going by my experience with torque app, it just was not stable enough to trust it and some of the readings were way off - seemed a lot better hard wired , if given the option i would hard wire over any other connection if possible just to eliminate possible issues with something as important as data logging or loading a map
Torque app connected to one of several OBD Bluetooth dongles from 3rd party manufacturers?
Of unknown data rates?
Of older Bluetooth versions?
And made for the "interest" value rather than a dedicated platform?
Apples and pears.
As an example these "hobbyist" OBD dongles use the ELM327 codeset and protocols. Transfer rates are in teh range of 10-500kbits per second.
Bluetooth 4 is around 25Mbits per second.
See the difference in data speeds?
Also there are a lot of poor ELM327 clone devices around with dodgy copies of the Version 1 ELM 327 code with very poor performance.