I think both have their place. I like the reduced power usage of LEDs as well as making the inserts really show nicely. For the GI though I like mostly incandescent with some LEDs to accent certain areas. The incandescent filament sits well above the playfield and lights evenly vs. the LED element at the base of the bulb. Also i do see a little of that flicker when tracking a fast moving ball with LEDs, but less so when they are in the inserts. I think hands down LEDs in backglass to give the GI connector a break, and in inserts to make the light shows look amazing. For most of the playfield I'll stick with the oldies. Plus in the WPC game I have the LEDs don't look right when dimming. The system 11s don't dim so there isn't as much of a problem.