XD trigger is heck of alot better than the CZ100. CZ pull is long heavy DAO. Dont believe they even make the CZ100 anymore they have the CZ110 in Europe which has a trigger system similar to walther p99.
almost bought a CZ100 but I decided to go with a Steyr instead. fit my hand better. XD was not making alot of noise they were mostly out of stock selling like hotcakes.
dont believe the CZ100 pistol is a good pistol in 40S&W. definately on the smallish side and rechambered from 9mm to 40S&W. XD was made in 9mm and rechambered for 40S&W but was a beefy pistol before the conversion and handles the cartridge quite well.
hmm see someone found a mod for trigger.
XD's are alot more popular and plentifull. quick glance dont see hardly any Cz100's floating on auction sites. spare mags look like a pain to find and costly $30+
the cz100 has a polymer type finish havent heard of issues with rust. the XD is known of rust but can get it refinished. can get the XD trigger worked on also though dont see many complaints,very few. with the XD you get 12 rounds +1 in chamber. the Cz your stuck with 10 ban and no ban apparently.
find em both and see what fits your hand try the trigger if you can.
you can see info on the cz110 at the CZ Czech website
http://www.czub.cz/index_en.php
the XD is made in croatia and imported by Springfield Armory.
forum to find good info out on XD
www.hs2000talk.com lots of good people
cz forum
http://p201.ezboard.com/bczechpistols82792
might want to look around. another pistol you might want to add is Steyr M40 though they have newer model coming out some month in the future. similar to the CZ100 series though bit bigger heavier, though was designed around 40S&W and then rechambered to 357sig and 9mm.
hit cdnninvestments.com and check the newest catalog in pdf format they got some nice deals on whole bunch of new and used pistols.
if concealer carry is an issue the cz100 would be better.