really tough question. My choice would be about which has the most reliable motor. Over the years growing up, my Dad had many boats and the motor on a few ruined more trips then I care to remember.
I don't know what a 86 ranger fish and ski looks like but I own a 1995 19'6 Ranger fish and ski that has a walkthrough windshield. Total package is about 3500lbs. The boat is extremely stable to fish and I can take all 3 of my kids on it plus my wife. The downside is the weight you have to drag behind your tow vehicle which needs to be able to tow at least 3500lbs. My dad is in his early 60's and can't even push the ranger around the garage. Ranger boats are generally built very well and hold up for a long time if they are taken care of.
The tracker in question is easy to handle, can be towed behind many vehicles and will be economical but slow on the water. You will find it fine for one or 2 guys on calm protected water. You will find it unstable on open water like Kentucky lake. At 16ft, I'd think twice before taking it out on exposed water in Lake Cumberland when the deep V hull cruisers are passing by and putting out huge wake.
As a fishing platform if the 86 ranger is anything like mine, it bests the tracker by a mile. Mine is just so much more stable and big. I regulary fish out of a 2004 17.5 Tracker on the Canals around Lake Okeechobee in florida. Works well but you know when the other guy moves in the boat. Hope this helps a bit.