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There's 2 price tiers. The TF100 VS K2006 and the TFpro VS K2006*C*.
For the cheaper bracket, the TF100 is the hands down winner with 2.7X the supplies. A literal no brainer.
For the pricier bracket, the K2006C was 'commercial'. It has less FC/CYA tests that you'll do more often and more CH/TA tests that you won't. So you'll likely be replacing half of it early and throwing out the expired other half. Then the TFpro includes a $48 stirring device that you really really want. Adding it to any of the other kits bumps their price. The difference in cost at that point between the TF100 + smart stir and the TFpro goes to the nicer TFpro case for a couple bucks.
I've had both and while the TF100 was entirely functional, having the bottles lined up in order is SUPER nice to not have to fish around because they aren't organized in the TF100 case. For the small price difference of the TF100 + smartstir, you'll appreciate it time and time again.
Also, either TF kit is available with a SLAM option, which is great for newbs and/or those with swamps who will both be testing more often and might blow through the normal supplies for FC/CYA.
Also also, either TF kit is available in a salt version which bundles the $30 salt test kit for $20 more. What's not to love ?