I honestly don't see how the perimeter lights can be better than qty 2, 2x4 panels, end to end. The perimeter are focused on the edge of the table as a narrow beam. The wider panels are at the center of the table. When you make a "cone shaped" beam of light coming down from either type, I'd think the wider center panels would have more even illumination throughout the table.
That said, I've played under the perimeter style, and the LED style, and feel they both work just fine.
I personally think the perimeter style caught on because they look substantially different. That's enough to get people to buy, even if they are not better than the much cheaper LED commodity panels made for drop ceilings.