Gzip better than Bz2 ? Normal?

[Franck Y]

Hi everyone,
I ve got a strange behavior with bz2 and gzip.
When i compress a small folder around 225 Mo the compression goes to
  49 Mo for gzip
46 mo for bzip2

When i compress a bigger folder around 5 Go the compression goes to
2.6 Go for gzip
3.1  mo for bzip2


Bzip2 has a better compress for Small folder and gzip has a better one
for big folder.
Has anyone of you has the same effect.

Maybe gzip did'nt compress everything how can i check this.
Should i be worried.
It's mostly office document.
Happy new year,

Franck



--
Franck