Well the "benefit" is less power consumption for sure.

AS for the finer details there are tons of info on different threads here. You will never get a large group of peopel to agree on one of of doing things though, or one company to buy them from.
I wish I could give you an easy answer but there really isn't one. You need to buy some and try them to tell.

For some people it easier for sure. The only issue people can have is whom is making the decisions and how free are they with the colorings. I cannot comment on Pinballbulbs but places like Cointaker will make up whatever kits they want and it can be a shit show (in the past at least). They've decided for that insert we're going to use a RGB color changing LED...ummm wtf? These plastics are purple so we'll throw in some purple GI...