My Opinion. Here it is for the record. Take an out-of-the=box E-Trac and an out-of-the-box V3 and give them both to a beginner and that individual is going to be finding Silver with the E-Trac long before they find their first piece with the V3. Give the same machines to an experienced user and I will still give the edge to the E-Trac. Modify the V3 with a better coil (SEF 10x12) and use the custom tone setting to modify the -95 to -93 range and accept that range in your discrimination pattern as well, and now you have a V3 that will run deeper than the E-Trac. The choice of the D2 coil by Whites is it's weakness in my opinion. Because of the 22.5 kHz frequency the targets will wrap to the negative side when deep. The versatility of the V3 allows for you to compensate for this though. I will have my E-trac by February or March. Not because it's better than the V3, but because it has a clear advantage when it comes to deep silver. You can never have to many detectors either.
We are fortunate to have some very experienced Whites users here on the forum. What makes them even more valuable is these long time Whites users have purchased E-Tracs and have very good perspective on essential differences. Angel, Okie and Detector are very experienced, and you stand to learn a lot if you follow their post. That being said, I would go head to head on a test garden with any of them and I believe the V3 would prevail at this point.
Keep Swing'in
Jack