I'd say avoid HIDs and go for proper OEM xenons. You won't regret it.
? you mean avoid HID retrofit kits to halogen reflectors ?
The OEM Xenons are HIDS (High intensity discharge).
IME -
HID Xenon burners (bulbs) in reflector headlamps don't work well. Poor beam pattern, too much glare and generally ineffective.
HID Xenon bulbs in projector headlamps are ok if fitted correctly. The lens collects the light from the bulb and concentrates it a lot better than a reflector would with the Xenon HID bulb (which would be outside of it's focus compared with the halogen bulb).
Best is the OEM usually, though you can buy HID Xenon projector units which are just as effective or better in some cases.