Take my opinion with a grain of salt. I have handled both but haven’t shot either yet.
Ruger Target
Pro’s
1. 60* bolt throw (very smooth action on the one I’ve handled)
2. 10/22 magazines
3. Aftermarket trigger (timney)
4. Threaded from factory
5. Thumbhole stock is pretty comfortable
Cons
1. No quick barrel change option but gunsmith can put on another barrel for you.
2. After market support is low for things like chassis
3. No Lightwieght barrel option or 17hm2 option
4. Bolt knob is fixed on there
CZ 457
1. Barrels from 455 work on them (Lilja, wpbc, etc...)
2. 60* bolt throw
3. Adjustable trigger
4. Traditional safety
5. Aftermarket stocks and chassis (many are coming out)
6. CZ 455 mags work in it
7. Can go from 22lr to 17hmr pretty easy
8. Lots of aftermarket bolt knobs you can put on yourself
Cons
1. More expensive
2. Bolt isn’t as smooth because of the laser engraving on the bottom
It’s a tough decision.
FWIW if you do get the ruger and it doesn’t shoot well there is a gunsmith in Michigan I think that has rebarreled them and they seem to shoot much better.