The fewer Xenons in the country the better. The most selfish option to tick in the world.... You might see a little bit more, but every other fecker in front of you will go blind and be distracted by the bouncing jittery light show.
Erm, the only xenons which dazzle you with the 'bouncing jittery light show' will be the highly illegal aftermarket retro-fits!

Proper factory fit xenons, provided they are correctly adjusted, will not dazzle, and 99% of the time, will not bounce and jitter. There is only one scenario when they will, but then generally, oncoming traffic is obscured anyway.