Other than the brake the biggest difference between the two saws is the HUGE Trunion on the SS and the medium sized trunion on the PM. Look up under the table
inside the cabinet of both saws. You will notice two major differences aside from the brake. You will notice the SS has a better dust collection design (IMO), and that the SawStop's trunion is about twice the size of the PM. (Not my opinion, but a fact.) The trunion on the SS was designed for 1 million stops. That's a lot of force. Therefore a lot of beefy cast iron.
Don't get me wrong the PM is a great saw. But the beefier trunion in my opinion give the SS a more solid feel. (Although in truth they are both very solid) The beefier trunion also means you will probably never have to tune the saw after you set it up. The beefier trunion does weigh more so it might be something to think about when trying to get it down the stairs to your basement shop. The beefier trunion also means you get pneumatically assisted wheels on the raising and lowering the blade as well as the blade tilt. The PM's wheels are fine, but the pnuematically assisted wheels are a dream to use.
The PM has a more robust side feed table. The SS is fine. It is equivalent to Deltas. Mine has not warped or had a problem in the 7 years I've had mine and moved 4 times, used it a ton. I've also stood on it once. (I didn't want to but I was hanging my dust collection tubes alone and well you know...) But the PM's table top is a thicker design. The SS is a slightly thinner design with support rails. If you are thinking or removing the side table to add a router table then this point is moot.
Having dealt with both companies a little bit I can tell you PM's customer service is okay, SS's is the best in the industry.
PM has a descent manual that comes with their saw. SS has the best manual I've ever seen. Not just the best saw manual I've ever seen... I mean the BEST manual I've ever seen.
The other difference I can think of is back 7 years ago the PM's riving knife did not raise and lower with the blade. Which means you have to remove it for non-through cuts. Which is fine as you usually don't need it for non-through cuts, but the more often you have to remove a safety feature the less likely you might be to put it back on. Maybe somebody out there knows if PM's riving knife design has changed and it now goes up and down with the blade.
Oh and then there's the brake. You will never have buyer's remorse like the buyer's remorse you will have if you should happen to cut off a digit or two after this purchase... just saying.
But, if I were you and trying to decide between 3000 dollars for the SS professional cabinet saw, 3500 dollars for the PM cabinet saw and 3900 dollars for the SS industrial cabinet saw. To me, this is a no brainer. You are spending a lot of money for a saw.... BUY THE BEST saw you can get in that category. Buy the SS Industrial cabinet saw and enjoy it for the rest of your life. Teach your children woodworking on it. You will not regret it. In the 7 years since I dropped about 4K on mine I have had exactly 0 seconds of my life where I didn't think I made the exactly right decision.
Not real sure about most of that. The SS Pro is 3K at woodcraft, the pm2000 is 3K at woodcraft.
Those two saws are not on the same level the pro is a small light weight saw, more comparable to the smaller jets.
The PM does have a moving knife, that is what makes it a riving knife vs a splitter. The PM knife didnt change its always had one. It was one of the first to have them.
The competition is the SS ICS not the PRO. The PM's and the ICS are 30" tables with bigger motors.
The ICS is closer to 4K where the PM is 3K.
The moble base does not come with the SS. PM its built in and works like a wind up watch. Pull out the crank and turn. Very easy, they skate around like they were on ice. They are hidden under the saw and dont hang off the base.
The ICS and PM both use the same shrouded dust collection system.
The trunion is not beefer it has more parts. The ICS uses 62mm bearings and PM uses 100MM bearing. The SS is a split drive saw meaning one belt drive a counter shaft and the other drives the arbor. The mass of the trunion reflects the additional drive assembly. The PM is a single drive saw with less parts.
The PM owners manual is on par with the SS at least in PDF format anyway. Never seen the SS in print.
The Pro is light, the PM and the ICS come in at about the same weight class within a few pound of each other.
The center lock cranks are all PM on both saws, PM owns the patent.
PM's customer service is top notch. They ship parts needed quick and dont question anything. If its broke they fix it.
PM side table is not thicker or better in fact its identicle. This only changes when you add the build in router lift from PM then you get a better table.