I haven't done much night Crappie fishing in recent years, but here's my experience :
Is the bite better ? .... not necessarily, but it can be. It's definitely quieter, cooler, and the water is calmer (due to less boat traffic).
Do you catch bigger fish than during the day ? .... not particularly
Do you use green lights ? .... I've fished over green lights (once), but mostly over white lights. I've used Coleman gas lanterns, Starbrite submersible light, and a Berkley 12v Floating Light over the years ... and the floating light is the only one I still use. They all work to draw in baitfish, which is their primary function. LED lights are the way to go, nowadays, as they don't draw as much power from your battery as 12v lights & they're much brighter. But, I don't night fish for Crappie as much, nowadays, as I did decades ago ... so my floating light serves me when needed (I just take an extra battery for it).