As TerryP sayd if you don't need the features from 2.x you can stay with 1.3.
If you have mixed environs like Open/FreeBSD and linux machines running apache I suggest pick
the one that is best supported at all systems, that makes configuration/move to other host easier.
I stayed long time at 1.3 then at 2.0. Now all my apaches (nearly 20) are running at version 2.2.8 but with a custom layout.
I don't like how different distros build the apache config layout specifically debian.
One thing that is verry good implemeted in FreeBSD is different apache instances (i think this is only with 2.0/2.2 possible)
for example in /etc/rc.conf.local
Code:
apache22_enable="YES"
apache22_profiles="mgmt internal external"
apache22_mgmt_enable="YES"
apache22_mgmt_configfile="/usr/local/etc/apache22/httpd.mgmt.conf"
apache22_internal_enable="YES"
apache22_internal_configfile="/usr/local/etc/apache22/httpd.internal.conf"
apache22_external_enable="YES"
apache22_external_configfile="/usr/local/etc/apache22/httpd.external.conf"