AS is just geared toward military aircraft, the TS is an all around color selection, they are both synthetic lacquers... (just found that out tonight)
http://www.tamiyausa.com/product/category.php?main-id=60
Dunno about the difference between the two silver colors but to me something with "XXX" Leaf as the name implies shinyness as in chrome or such... I think I would feel safer with the BMF of the AS series over the Silver Leaf just from the name.