difine "best" and I'll answer that
Sunlight is the best light for plants.
they grow better in regular sunlight because it is more natural
because some wavelengths are more simliar to the ones the sun emits and natural light is best for growing plants in which case the more similar they are to the sun's wavelengths they are, the better it is for the plants.
Red color of light
sunlight
green
balls
buh
water no light
plants grow very well on the sunlight. it can prepare photosynthesis with this sunlight. it gets lots of vitamin-D in the sunlight
They don't. Plants need the light, sunlight, to get photosynthesis to grow and not die.
The best light is either fluorescent light or natural indirect light, not direct sunlight or your plants will receive burn marks. Keep plants moist, let dry out a tiny bit then water them again.