As far as the modules go, Bluetooth = Android, WiFi = iOS.
Once paired you can update firmware or settings easily (no PC required) takes about 30-45 seconds to do the firmware.
Range for bluetooth is about 5m.
(I can stop the car in the pits, connect, update, disconnect, back on the track, in under a minute, good for practice. The car stops as soon as you connect. Can also check temperatures/battery status via the module. Which is nice.)
Once you've got settings sorted, you may as well just take the bluetooth module out, as it's just something else to get knocked out of position/damaged/fail during racing. It's also quite an awkward shape to fit into the car.
Its worth having a PC as well, cos sometimes you like to use the programming box/USB etc. But you don't actually need it.
I'm running the reventon software on a galaxy SII, HTC one and a Galaxy Note. So it runs on all androids up to (and including) 4.3.
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