comparison of Tung Sol & GE 6550

How big are the differences between these tubes and what are the differences. I have heard about some people who seem to like the Tung Sol.
Some folks love Bose equipment! Anyway, you know all the big names out there: Ampex, RCA, GE, Mullard, Genelex, Telefunken. They are BIG for a reason... They sound good and last long. Don't discount the Russian and even Chinese tubes built of late. Blind testing reveals that they sound as good as most of the above tubes!!