LEDs or HIDs are a great option *if* you also spend the money to upgrade to projector housings. Traditional halogen reflector housings should never be used with HID or LED bulbs because the beam patter is wrong and they blind oncoming traffic. Especially folks with night driving issues, astigmatism, etc.
There are some that claim to have made bulbs that work because they have corrected the location of the light source on the bulb, but this is not the case. They still do not work correctly because the shape and direction of the light coming out of the light source is different even if the location is the same.
Also, most are a more blue light and the wavelength is longer than traditional halogen bulbs making the reflector less able to direct the beam.
I've seen plenty of folks claim (and truly believe, I am not trying to fault anyone for not knowing better) their reflector/bulb combo actually works. Remember, just because you can see where the cutoff is trying to be does not mean that it is actually cutting off correctly. HID and LED bulbs still have more "bleed" over the cutoff that is difficult to see from the driver position because of the increased overall brightness making the bled over light look relatively less bright. It is still very blinding for incoming traffic, and for yourself when it is foggy.
Really, most of the time a fresh set of quality halogen bulbs and a new set of quality headlights is all you need and can be had for $100 or so. That said, upgrading to HIDs or LEDs with projectors is a step further. More pricy at probably $300-400 for a good setup, but will allowthe most visibility. In the case of HID and LEDs go for a color value between 3000k and 4000k. It is not the bright white or blue you see most often with these setups, it has more of the traditional warm halogen color which allows better visibility in rain, snow, fog, etc.
If your factory headlights are not too bad, you can often just polish them clear again however, after you do this I would have them sprayed with plastic adhesion promoter followed by clear coat. Once polished they lose their factory coating and will fog over again in a few months. With clear coat they will last years again.
Whatever you do, just make sure you use quality parts. The cheaper headlight housings are extremely hot or miss, not just in preventing water ingress into the housing but also in matching the factory beam pattern. I have a set right now I pulled off the shelf for temporary use that are clear but the beam pattern is terrible. I need to clean up a factory set and put back like I talked about above.
