I tried them both tonight. Tune Ecu is pretty sweet. It works with the cable I got for tune boy too.
Here are some notes I noticed:
- map files are about half the size in TuneEcu when saved from ECU (compared to tuneboy maps)
- The map UI on TuneEcu is sweet, way better than tune boy.
- Both work on Win7 64bit
- Can't really do any "tests" in either of them. Mostly it appears its reading sensor data, which is limited in both. Still pretty good though.
I am sure head2wind has better opinions than me, since I bought the tuneboy cable from him. I have not tried to load a map through TuneECU. I only saved my current map.