I run the Dynamic EBL-P4, but I don't know much about the SD2 chip so I cannot make a fair comparison in terms of firmware and features. In the end, what it comes down to is user preference. With my setup, as the EBL learns VE you don't need to go back into the log, grab the data, and then make the necessary changes. You just "flash" the new VE in. It saves every .bin file from the base tune forward as you go, so you could always go back if need be just by "flashing" it back in again if you need to. I tune with TunerPro RT using my laptop which is not only free, but covers every conceivable area in the tune, and I datalog with the WUD (what's up display) which is included in the purchase using my tablet....