Hey Growmie,
LED lights are more energy-efficient and need to be replaced a lot less often than HID lights. This results in saved money and effort. Additionally, HIDs start losing their brightness as time passes and needs to be replaced even before theyre completely done. Since your growing autoflowers there really is no need to pay a higher electric bill along with replacing bulbs when the LED will do your autoflower just fine.
Hopefully, this was helpful and remember ..."Happy Growing" and "Free your mind one puff at a time".