Packer vs YUI Compressor

Hi!
It's just interesting: is there any reason (except of convenience) to
use YUI instead of /packer/ ?
Packer 3.1
jQuery 54 865
gripped 20,91 Kb (21 408 bytes)
====================
YUI 2.4.2
jQuery 55 272
gripped 21,47 Kb (21 985 bytes)