Here is my situation.
Over the last 30+ years I've put in a lot of time with a lot of detectors. At one point in my life, when I was younger, I put in a good 30 hours a week or roughly 750 hours a year since my hunting is seasonal for roughly half the year. A good part of that was spent with the "dig it all" mentality. I dug a lot of goodies, but a heck of a lot more junk. I never really felt the few goodies the "dig it all" concept gave me was worth the time I spent digging junk so I started to lean more toward being a selective hunter. The success of a selective hunter depends on 3 things. Experience, which I had plenty of, a very good target ID detector and a bit of luck. The luck is either there or not, but you can find very good target ID detectors that increase those odds and that is what I did. I went on the quest for the best target ID detector for me and my needs. I went through a heck of a lot of machines until I settled in with the DFX. Not an extremely deep machine, until you fully understand it, but in my opinion still one of the best target ID machines for the selective hunter.
I've been using the E-Trac now for 3 years with a conservative estimate of 15 hours a week or about 1125 hours total. I'm no E-Trac expert, but I don't consider myself a slacker either. I've run many head-to-head tests between the E-Trac and the other well known top of the line machines. Check my Youtube channel for videos of those head-to-heads on the DCDetector channel. I like the E-Trac because it is also a very accurate target ID machine when it comes to deep copper and silver. Lacks on the low gold and nickles, but makes up for it as a silver killer. I can take it to our city park and come home with virtually no junk and all goodies. Only one other detector has prove to have this ability and that is the V3i, but it takes a bit more understanding. Now to the TTF idea. I see TTF as not very selective hunter friendly, and in fact more to the dig it all mentality. If thats what you enjoy then it can net you a few more goodies. If you're like me, the selective hunter, you'll spend more time digging junk and trying to analyze those targets that it is worth in a few added keepers.