Try not to base your decision on lineage. There are some great 'independent' masters out there who have trained under various instructors and formed their own styles. Schools that show off their lineage are usually not that confident with their own skill. And before people start flaming - there is a marked difference between mentioning a lineage and showing it off.
Certainly, people like William Cheung has received a lot of flak over the years for boasting that he was taught the 'true' wing chun system, which is nonsense. Wing chun is constantly evolving and changing in accordance to the other martial art systems that have evolved. There is no 'correct' version of wing chun. Just what works and what doesnt. So my advice is to go down and have a look at the school and their training, as opposed to focusing on lineage and tradition etc.
By the same token, a lot of independent "masters" out there who trained under various instructors have a pretty shaky background when you look into it. The dagger cuts both ways on this one.