Think about what you desire in a table saw. Do you want a small compact form with a folding stand that you can store away? Or do you plan to have it out all the time in a personal shop? Do you want to be able to use a dado stack (Not all table saws support this)? Look at the motor RPMs; some units run at 3800, some at 5000 rpm. Look at the rip capacity, there are units ranging everywhere from 18 inches of capacity up to 32 inches for portable table saws for instance. Also look at the fence style; Dewalt as an example is popular for their rack and pinion style fence. What is your budget? Do you want a portable 18v unit or a plug in unit? If you want an 18v unit, is there a battery platform you already have 18v tools on that offers a table saw?
I think if you answer these questions and think about your intended uses, you'll be able to find the unit that best suits you.
I personally have a Dewalt DWE780 (Recently discontinued). It has a larger rip capacity than the DWE775. It was on sale at the time I purchased it, it has a folding stand which kind of *****. I would have loved to spring for the 7491rs but at the time it was a ~250 dollar price difference compared to the 780 I purchased, and the 7491RS took up alot more room due to its stand that I didn't have available when its in storage. Downside of the 780 is that it cannot take a dado stack
Dewalt Dwe7485, a feature that was not important to me.