I have Osram night breakers and they do provide a crisper more whiter light. Better output than stock OEM bulbs.
Although they tend to last a year or so.
Bulbs are easier and hassle free. Simple bulbs changes.
They dont provide the same output as a xenon bulb, xenons are miles better in light output.
Osrams - positives
-Cheap upgrade
-Easy to change
-Provides better output than stock oem headlights
-Auto headlights upon start up is fine for use
negatives
-Light output not as good as HIDs
-Light is not as white
Xenons - positives
-better whiter light output
-uses less power 35w as suppose to 55w
-ballasts all fit within headlight cavity - providing you buy the slim style ballasts
negatives
-alot of cheap kits out there - hard to buy quality and reliability
-takes time to install - headlamps need to be removed - which means removing front bumper. although most kits are plug and play
-If anything goes wrong with the kit later - headlamp and bumper need to removed to find the issue
-if a normal bulb blew - a bulb is easily changed
-Dont think you can have xenon hids on auto whilst starting the engine
-Not sure if beam pattern will be perfect
-Will fail an MOT - due to no self leveling system (not the beam height adjustment) - different type of self leveling system
-Wont be road legal