when comparing them on a deep target. Lower the tracking on the v3 to the 5 band and swing slow. You might also play with the sens, raising it and lowering the RX gain.
A buddy was not happy with the way the V3 was not hitting a minnie buried at 10" for 20 years... he finally lowered the tracking and slowed the swing and was getting a good tone an ID even with the coil 6" off the ground.
If you must swing fast... the F75 will be better for you I think. I keep a T2 for times when time is limited and the place is big... The ET and the Tejon will also work fast when time is a problem, but not as fast as the T2/F75... but if the place is trashy or the ground is really bad, the T2/F75 can be a problem, if there is a lot of iron, the Tejon is best... BUT when time is not a consideration, you can hunt a place over a long period of time, taking your time... I think the V3 can really sort things out... of course in a situation like that I would use all my detectors.
Depth isn't the most important thing to me and... speed plus depth = missed targets... I think.
J