I would recommend e-tuning over sending the entire ECU out but it takes a little understanding of the software as you'll need to pull ECU# and then do some back and forth logging/tune adjustment. The Z1 option is probably faster depending on the e-tuners availability but getting adjustments based on actual logging will give you a better map.
I would only only consider one of these options if you are NA. If FI then custom tune dyno tune is the only way to go.
However I completely agree with Chuck. If you have a local UpRev tuner, take it to him for a custom dyno tune.
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