I have both, a DeWalt 788 & EX21, they are both good saws. I have had some minor problems with the BIG YELLOW, but there is plenty of information on you tube about the fixes. I have also had vibration problems with EX21 since the day it was delivered, tried for a long time to fix it but the only answer was an unopened bag of play sand across the bottom of the stand. That is not what I expected from what was hailed as a premium tool. If you can find a first generation DeWalt (made in Canada) at a reasonable price, I would go for it. If you decide to go new, you can't go wrong with either of the saws you are looking at, as far as performance.
The DeWalt will save you some money. Oh, don't waste your money on the factory light that can be attached to the saw, there are many other better ones out there.
Good luck with your choice.