There is now and will always be more aftermarket accessories available for the CZ's than the Tikka.
Huh?
You can easily get aftermarket stuff for the Tikka, anything that fits a T3 will work on the T1x. At the moment there are a few issues with stocks not quite being a drop in fit, but that will be fixed in time without a doubt.
I have a T1x and a 452 American, whilst I really like the CZ the Tikka is the better rifle. The CZ is a pain to fit a scope low as the bolt hits the eyepiece and I sometimes have issues with brass hitting the windage turret and landing back in the action.
The factory trigger on the T1x is better, the bolts is snappier and the 60° lift is way better, 10 shot mag standard, factory threaded, the T1x stock can be easily accessorised to suit your style of shooting, there are replacement bolt handles for the T1x and a 16" 22lr option.
There are plenty of reasons to buy the T1 ovet a CZ, it just depends what your priorities are.
That being said I love my 452 and I wont be selling it, but the more I use my T1 the less reasons I see for me to use my CZ.
Edit: also the T1 safety is better.
There is a CZ 457 coming out soon which should level the playing field, but unless you want a wooden stock or something specific from one of the models I think the T1 will stock be the more adaptable rifle.