The F75 seems to have the edge a little on depth, trigger pull, more adjustments for all around hunting.But all in all both detectors are very good.Deep units, and so is the T-2. The t-2 and Funits are different machines though not to be confused as the same electronics .All are extremely comfortable for usage in the field.Some say putting the 10" Concentric coil on the F75 unit makes it a very very capable detector for coins.I find the 11" DD coil works better in some applications over the 10" coil.That's just my opinion and your results may not be the same.The response recovery time is unbeatable on both machines. The 11DD coil allows you to get next to iron and still read the Silver within an inch or so of each other.I do not know if the concentric coil would allow that same close proximity.The fast grab ground balance on the F75 seems to be a little better in hot ground.All in all if you want a great detector either one will work well with good depth..no "Great depth" would be a better description.The F75 seems to be a little better built.Not saying the f70 isn't good, just a different build.The hand grip is much more comfortable on the F75.My opinion it is the most comfortable detector I have ever used(F75), with the most all around depth.