The tr@ckspots have been discontinued as well as the Mighty Scans, just FYI (but parts are still available like trucker said). Personally, I prefer the Mighty Scans over tr@ckspots mainly because the are much, much smaller and can fit just about anywhere in a lighting rig. This is crucial when you have low ceilings and small stage space. They may be small, but they are powerful and extremely flexible.
Tracks take up more space all the way around. In the truss, and in the truck on the road. The Mightys may weigh slightly more, but they are far smaller and more flexible in mounting situations. Again, in smaller areas where the band has to be closer to the lighting rig, it would be nice to be able to move around under the truss without cracking you head on the body of a light fixture. We've all done it and it aint pleasant.
While working a show at a local club, I put my Mightys up against the tracks and the Mightys were just as bright and effective (not to mention the colors matched just about perfectly). The one thing the tracks have that the Mighty's don't is the ability to dim the fixture to different intensities of light. But from what I've found that using my intelligents in conjunction with par cans, the pars are more for dimming/changing intensities and the intelligents are great for effects, motion, chases, etc.
The one thing to consider with intelligents when thinking brightness is that a fixture can appear to be brighter when it can be mounted higher in the air. This allows the beam of light to open up much more than if it is mounted relatively closer to the ground (just a consideration). Also, make sure you know what kind of power consumption you can handle at different venues. Four Mightys for instance, draw 8.3 amps of electricity, whereas four tracks draw 11.7 amps. If you only have one circuit, you have to consider having enough power to run everything. The last thing you would want is the group to be in the midst of powerful passage, trading fours, etc.,...you hit the controller to accentuate the music, and then, everything goes out....amps, lights, mics, etc.
Don't get me wrong though about seeming narrow-minded about these lights. I know that the Mightys are not the best intelligent lights in the business. But considering things like up front costs, maintenance costs, operating costs, usability, presentation, and all of the logistics of where the can be mounted as well as moving them around easily, the Mighty's win my vote for a startup intelligent system that gives flexibility way beyond just startup (if that makes sense to anyone).
The prices of the fixtures can fluctuate in and around each other from time to time. I put my entire Mighty system together (lights, clamps, safetys, cables, controller (show designer), and nice rolling road case I modified for the fixtures) for a little over $2000. You can't do any better than that for such a flexible and powerful system. For a fairly used set of tracks, you'll spend $2000 just for the fixtures, with no cables, no cases, no controller, no clamps, and no place to put them. Remember, you'll need to purchase trussing and stands for your lights.
Obviously the lights ARE the most important part when making a decision, but it is also important to consider all of the logistical aspects of using a lighting rig.
Let us know what you decide on.
Best,
-Tech