Hey Latimer,
I recently went through this same dilemma and I bit the Bullet and bought both at the same time, except I bought the TS75. If this is not an option for you, I would examine your priorities in projects and maybe wait until you can buy both, or build your own as many others have said. During this time really think about you need and how it will increase your effectiveness as a woodworker. If you need some help, list your next upcoming project so everyone can give you input on which one, if you can afford only one.
From my experience, after minimal use, I have found that the two have synergy when used together, but either are equally good on their own. For me, I like the portability of the track saw, and I find that it is a equal replacement of the circular saw (in-fact that’s what it is but with a special base and plunge mechanism). I still have my DBSC miter saw that I use for angular cuts of smaller stock, but ripping angles on sheet goods has never been easier than with the TS.
In my limited use of the MFT/3, it works amazing for holding items in place during sanding, staining, or cutting. Also, for doing angular cuts on large sheet stock or marking out angles for then use with the track saw on the ground/ assembly table. Like many others have said, you can make your own 20mm holes since you have a router, and make it to the dimension of your needs.
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