There is NO debate - red LEDs should always be paired behind red lenses. If you use white LEDs a lot of light will be filtered out. You can search the web for a better technical explanation.
For the tail lights there are simply NO current LED bulbs on the market (except for two) that perform better than incandescent. Projectors included. This has to do with the reflector optics. Forward facing LEDs only shoot the light ahead in a very narrow beam (like a flashlight). But you need a wider spread for better (SAFER) visibility. And although these narrow beams can be very bright and intense, as I stated, the spread is not wide enough to be safe.
Currently the king of the hill for retrofit stop/tail and indicator bulbs is the VLEDS V3 Triton
. Using 3 Philips Luxeon Rebel LEDs mounted under a properly designed acrylic optic lense, its super intense light reflects backwards towards the lamp reflector with much more illumination than an incandescent bulb.
The new retrofit bulb I just discovered yesterday in fact comes from Philips themselves dubbed the Philips X-treme Vision LED
. With only a limited amount of bulb applications currently there is a 7440 that can be used for our front and rear turn signals. It utilizes a Luxeon Rebel LED in a rear facing fashion (the red stop/tail application has 2 LEDs). And based on some of the youtube videos they appear to be as bright, if not slightly brighter than incandescent.