First welcome to the forum - it's the best and I think you'll like it here.
I am not unbiased in that I own a XDm in 9mm
I own 2 other 9mm's and tthe XDm shoots best by far. My others are compacts that I've carried for concealed carry and a backup gun as a LEO.
I have no experience with a CZ and in fact have heard that they are fine guns.
I have a tendencsy to buy different brands all the time, but I always borrow or rent the gun at a range and shoot it - really shoot it before I buy.
Some guns look good, but shoot bad - all guns shoot a little differently and come to point of aim a little differently for each person.
So I say go try them both and buy the one that "fits you best.