To my (albeit limited) knowledge the only things that will really affect a Matrix's performance will be things like different bolt kits, having a PBC / Trinity reg so you need to check whether the LCD comes automatically with those over the LCD.
An LCD with bolt kit and PBC / Trinity should perform exactly the same as an LED with the same bolt kit and PBC / Trinity. All the LED gives you is the ability to set forward and backward dwell without resorting to DIP switches and some game timer facilities.