I've done both. After been there done that X4 - I go with the DBW everytime.
Why?
1. you can stuff a lot larger cam in there and with the right tune it won't stall or hunt for idle like the alternative as there is much more control available than just the screw set and idle air motor found in the dbc.
2. CRUISE CONTROL - with a complete DBW, all you have to do is hook any old or new GM column mount cruise switch up and you are good to go. It is that simple.
3. CLEANER - the pedal takes up a little more space, but no cable to run or adjust or look at. You will have wires going to the t/b no matter what - so what is the big deal of adding two more (that is all that is needed to power the motor - all the other sensors/switches are fairly identical in number to the dbc on the i/a and tps sensors).
4. It is THE thing - dbc is so.....10 years ago.
5. Issues have been ironed out - seems like all the aftermarket harness guys have a handle on this now - and there is ample info out there. you can run into some problems as all DBW gm parts are not the same. In other words, a truck throttle body and Corvette are different - so if it is an early DBW, the TAC module has to match the parts being used making mix and match harder. In the current gen of DBW, it is more simple as there is no TAC module, but the t/b and pedal still have to match up. So...a little more homework is needed but once the right stuff is there - you are golden.
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