How can i test/benchmark my speeds? i mean the car bus speed or the bt dongle i have? Is it function of lap timer, or external benchmark app?

I just bought app and xgps160, and want to buy now obdii adapter ... do you think wifi version will be better when gps is already on bt, or it does not matter? How cani benchmark my bt or wifi obd2 and see how fast is it? I am on android, Note4 samsung if matters.