COMPRESS() vs myisampack

[Jacob Friis]

I have a table with lots of text data, and would like to compress this 
in order to save space.

I would either compress the whole table with myisampack or just the text 
data with COMPRESS().

When I SELECT from this table, would it be equally fast to use 
UNCOMPRESS() for text data or use a table packed by myisampack?

Thanks,
Jacob