I haven't used every detector made known to man,,,but etrac or Minelab CTX both will aid a detectorists in separating the junk from the good targets.
Etrac IMO for the $$$ the best here.
Some things an etrac will let you do\not do.
You won't dig steel crown craps,,,,they I'd as iron,,you won't hear with typical settings.
You won't dig pull tabs,,,now if you are trying to find gold,,yes,,but not copper and or silver coins /jewelry.
Disc pattern is easy to understand after just playing with detector a little while and some junk targets.
With stock coil attached and using some settings for better depth,,,user can expect to locate dimes in the 8.5-9.5" depth ranges
Detector does give good ID also on nickels,,but sometimes balls of tin foil can read the same similar.
Etrac is a professional coin detector,,,for the loot,,,,this model unit has a strong following,,,a good history for few malfunctions.
I at one time had 2 etracs,,,running stock sized coil on one and smaller coil on another.
Btw,,aftermarket coils are plentiful,,and not to espensive.
Never have to worry about ground balance.
Unit performs superbly compared to most others in areas typically riddled with EMI.
When using an etrac vs many other Vlf detectors,,,,what is generally the rule,,,overall percentage of holes dug vs good targets in them---- far higher.
All this I talk about here,,,is no sales gimmick,,,but rather my experiences while using.
Whatever you decide,,best of luck.