Philips had the best reflector design but weak LEDs. I considered gutting and replacing with CREE XML with an external battery pack mod. This has been done and well described on another forum.

Fenix BT20 is a single LED design with a longer throw than the BT30 dual LED light. I also prefer the switch ergs on the BT20 because the button is ever so slightly larger and being recessed, it is easier to turn on or increase power when wearing winter gloves or lobster mitts. The only place to effectively mount the BT30 is on the handlebar due to its weight (batteries are contained in the unit) IMHO whereas the BT20 has a separate battery unit so, the headlamp is relatively light and can easily be supported by a NOB on the fork or even a NOB on clip on Tri bars. YMMV