i use Philips or osram nightbreakers but have experimented with HID and LED on 2 of my ducatis and some cars ,,I still think that HID give best results but are unreliable due to all the ancillary ballasts ,, and although aftermarket HIDs are cheap now its not roadside fixable ,,, and even more of a problem in cars or bike using canbus systems often have problems
LEDs often put out intense light but beam definition is often illegal and again reliablity of the bulbs is still poor even for tail lights and sidelights,,
also LEDS often require resistors to work in unison with other parts of a bikes series circuits .. that conflict with the LEDs characteristics
So for now i find conventional bulbs a better practical answer ,, for beam defintion and ease of repair and reliablity
I recently converted a friends Mercedes car from HID to H4 due to continuing unreliablity and high repair costs he was having with original factory HID system ,, he is very happy ...