Hi Bernie,

It really depends on the type of tea itself. While Chinese greens
tend to have fuller leaves, sencha will usually have a lot of small
particles-- it's not just your store. It's just a result of different
processing methods, as far as I know, and doesn't necessarily mean
that one is better than the other. If, hypothetically, you had a
large number of different batches of long jing (or some other Chinese
green) there may be a general correlation between leaf fullness and
quality, but it's more of a trend than a rule. Teaspring.com is a
fairly reputable source of Chinese greens; and o-cha.com, hibiki-
an.com, and zencha.net are good sources of Japanese greens (like
sencha). Hope this helps!

-Brent