I can't speak at all to your Tracker option, but I am the proud owner of a 2018 Nitro Z19 Sport, which I have been enjoying for the better part of 2 seasons on the water.
Your post doesn't specify what family-oriented features you are looking for in addition to fishing (e.g. water skiing, tubing, swimming, etc.), but the Z19S is, in my view, the best all-around choice for all of that. You won't get all features for all such activities (e.g. full fishing storage, huge casting platforms, deep-v hull for tubing, permanent tow anchor, etc.), but the trade-offs are worth the all-in-one combo. For example, the swap out of the rear fishing seat for the ski/tube pylon is sweet, you still get forward and aft casting platforms (the forward platform is much smaller than a pure fishing boat of equivalent size) with a large deep-set seating area for 5 that is spacious and comfortable, you still get some fishing gear storage (nothing like a pure fishing boat) while also getting custom storage for the ski/tube pylon, nav lights, seat posts, etc., there is an large insulated cooler and 2 livewells and there is a full on swim ladder pre-installed on the starboard side of the stern.
In addition to my comments, carlyle2 makes some good points as well.
A couple of final words/cautions:
If you decide to go with the Z19 Sport, when ordering, ensure that you choose a trolling motor that is at least 80lbs thrust. If the 70lbs thrust is your highest option (it was for me), buy your TM separately. I spent my first year going crazy with the 70lbs thrust MinnKota that I bought with the package, as it lacked power. Over this past winter, I upgraded to a 105lbs thrust TM and am much happier.
Also, if you want to put PowerPoles or Talons on your boat, make sure that you consult with a qualified professional about the appropriate size of jackplate and mounting brackets BEFORE YOU BUY. I went through some pretty annoying times in getting my Talons installed due to the size of the sponsons and the depth of the transom. I have a thread in this Forum about it. The issue eventually got resolved and I am loving my Talons, but the process of sorting everything out was frustrations galore.
I hope that this helps and good luck in your search!
C