All i use is just the plain good old reliable green T2,why its light,swings great,very easy to alter the settings and a very flexible all round machine and at the current price a bargain for such a versatile machine.
Settings that you see folks post on the internet ie on YouTube or FaceAche are just very basic guidelines and what i mean by that is what works for one T2 user may or may not work for another T2 user,we all detect differently,ground conditions,some do park hunting,relic,so no one can give you advice really or 'special magical setting' as those can only be fathomed out by yourself.
I personally shoot the basic green T2 from the hip in the UK,so my detecting scenarios are maybe vastly different from say someone across the pond,also someone who just hunts say parks,tots lots or really trashy sites like old homesteads or what ever you call them will be not the same as how i use my T2,i hunt mainly open farmland or pasture,also we are very lucky that our history goes back a very long way say 1000s of years,so our targets can be deep but also saying that some sites like say a roman/saxon site can have alot of trash in the area and many other problems that we encounter while detecting.
So one day i may be on a busy roman site that has 1000s of nails that came from roman hobnail boots,these nails had been used in the shoes soles to reduce wear on the soles,in those days you could not pop into a local shoe shop and buy a new pair of boots,so longevity was the name of the game,but the nails can become a nightmare when detecting these sites so to be able to get in between the trash to get to the really nice quality targets i would use a small 5'' coil,thats like a surgical laser beam that can pick out the decent targets from the bad rust hob nails and i think you can get the drift on what i am saying on a site like that.
But if i am on say a clear open farmland or pasture site and the targets are deep or i suspect a possible hoard is in the location then i often bring out the big fellas the large 15'' SEF or large NEL coils to play,these when using the right settings on clear ground and also the experience to use such a rig then a old green(classic) T2 can perform as good or certainly better than alot of other highly complicated detectors.But then i could also change my settings from field to field and i can also adjust my ground balance say every 15 minutes if need be.
I have always said that just because you buy a brand new detector or own the most expensive detector on the planet does not make you find any more,bottom line is a detector is just a large blob of plastic with some electronics inside,on its own it does absolutely nothing and even in the hands of a novice it does not do much better,but you give that detector to a skilled and honed detectorist and he/she will make it start performing and producing finds,its called 'experience' and that comes from not owning the most expensive detectors but learning what your detector is telling you,then and only then will you start to see a improvement in your finds,of course a detector will only find metal objects in the ground if any are in the ground to start with that is.
Had my trusty T2 for a long time and still learning all the time,some of my detectors like my DFX are well over a decade old and i have put a few 1000 hours on the clock with that detector but once again i am still learning new things.
I can only give some insight into how i use my T2 and in my detecting environment,what works for me may not work for others,but the No1 thing is that i thoroughly enjoy my detecting and that for me is the most important aspect of this hobby/interest.