How much are you investing? LEDs cost alot more than HPS or MH (both HIDs). HIDs give out alot of heat, ALOT. But when used correctly, they give alot of dope too. COB led in full spectrum is probably the best way to go if price isnt an issue.
Check out my diary
growdiaries.com/diaries/62572-royal-queen-seeds-green-gelato-grow-journal-by-ganjalab
you can see both in action, leds and hps.
Btw, check out LEC, light emitting cheramic too. Ive heard good things.