The Lobo SuperTRAQ takes the hassle out of ground balancing, to be sure, however, the auto-tracking circuitry only functions in the All Metal mode. The Disc. mode's GB is internally preset. The original Lobo requires manual Ground Balance, but it isn't difficult, it lets the operator be in control, AND it is tied in with BOTH operating modes! In my book, the Lobo winds in this consideration.
The weight and balance virtually the same, depending upon which coil you have mounted and in this consideration, the Lobo Super TRAQ appears to be the winner due to the greater number of search coils available for it. In the long run, however, it really depends on what you'll use the Lobo/Lobo ST for, and if it will be your only detector. If I had a Lobo (original) with the stock coil and the little elliptical (especially concentric) then I wouldn't be very concerned about it.
I've had and used them both and, overall, I prefer the original Lobo. At times a Lobo or LST was a main-use unit and other times a 2nd pick, but I always had more than one detector to better handle a variety of hunting tasks.
Monte