In answer to your questions:
My only experience with Europea Format saws (those with a sliding table supported by an "outrigger" is watching and drooling over an Altendorf as it operated at nearby Anderson Plywood near the old MGM studios.
Unvelievable, for safe handling of 4x8 sheets of 3/4. The saw ripped them into 18" strips like it was cutting bacon with a sharp knife. Meanwhile, the operator stood at the corner, a good 4 feet to the right of the blade. Safety is my big reason for wanting a slider.I will be doing a lot of sheet work, and will be alone in my new shop.
In talking to owners of these format saw, I would say the safety margin over a regular tiling arbor table saw is about the same as the difference between a radial arm saw and compound sliding miter saw.
As to getting a solid table, the General model from Canada weighs 750 lbs plus with a slider and 5hp motor. The same item in General's Chinese version weighs 500. Whatever I buy, this will be me first and last table saw. The 5hp is important because I'm moving to timber country in the far north part of California. Wet wood might be more common than I'd like.
General was the manufacturer of Biesemeyer fences for decades, so that part of the deal is a slam dunk.
Gary C.