Subjective for sure
I bought both Minlab coils 17 and the 6
I find myself using the 17 most of the time , I feel I want that extra depth and ability to cover more ground.
There have been some trashy places I’ve used the 6 and it does a good job but going from a 17 to a 6 is a big differance , like there’s nothing on the end of the shaft.
Pin pointing with the 17 is a learning experience . For me the wiggle back works best and after you get it diled in , very accurate.
The 17 can be a load, if my spot has a lot of siggable signals you get to set it down occasionally but if you get in a clean spot and don’t get a break , it can be a load.
, I can switch arms and not get arm weary . I’ve got a harrness but don’t use it .
There’s some after market coils I guess but I’ve not used any.
They seem to pop up used occasionally
Good luck with your search
BT