Scott,
I have both systems.
I bought the Festool ATF55 first, and I use it with a CT22 vac and MFT1080. It cut my usage of the table saw by about 30% within a week of getting it. The dust collection is 90-95% when you are not trimming an edge. I always hook it up to the vac, as it is integral to the design, and have been very satisfied with my purchase.
But I was always curious about the EZ Smart products, in part due to the SRK for routing dados. I got the SRK first to work with my DeWalt router and was very satisfied. Now I own the SGS-64 and the Cabinetmaker.
I have not had a chance to use the Cabinetmaker yet, but have used the SGS-64 with a Bosch 1658 circular saw with a $15 Freud Diablo blade and made some dust collection mods to get about 70-80% of the dust. I recently picked up a PC324mag as people say the dust collection efficiency with a small mod is about as good as my ATF55.
The following are just my personal observations, from using both:
The cut quality is an absolute tie, no small accomplishment for an older Bosch that was $99 and with a $15 blade.
The Festool ATF55 has better dust collection, as compared to the Bosch, yet some other saws such as the Hilti 267 and PC325 may come close or equal to the Festool. But, also keep in mind the TS55 may have better dust collection than mine.
The Festool rails are flexible and will lay flat on a warped peice of ply, which has been very helpful twice so far. I did have a problem with a 'bump' when I joined 2 Festool rails, and Bob M gave me some tips and it has been perfect since.
The EZ rails are very substantial and strong, great value considering how the price of Aluminum has climbed over the last two years. I like the EZ smart clamps better than the Festool clamps.
Ask yourself the following questions:
How much can I / do I want to spend?
What saw do I like best?
EZ is made in USA, Festool in Germany (both first-rate build quality), does this matter to you?
Stay objective, keep an open mind, and you can't go wrong.
Bob M. has always, and promptly, and without a sales pitch, answered all of my Festool questions. He has also stepped in with other issues to be helpful.
Dino has been generous with both his time, experience, and products any time I needed. He has been very welcoming to me as a Festool user on the Eurekazone forum here at SMC. He is passionate about safety, and I absolutely respect him for that. His constant search for something better and safer, even if it means less profit for his company, puts Dino in very rare company in this world. And if I want to complain about the race to the bottom at the wheel of the greed machine in the tool industry (EZ and Festool excepted), then I feel I must point out and support those like Dino who take the high road.
My advice: Get both!
Pete