I have a Savage Mk II FV that I put into a Boyds stock (identical to the TRR-SR stock) for less money all up. The FV barrel isn't fluted, but I think is otherwise identical. The extra rails on the TRR-SR are probably not going to do anything for you other than add weight, and really, a muzzle brake is unnecessary on a .22LR. If the TR is available cheaper I would say go that way all else equal.
Accuracy on mine is great - at 100 yards I'm sub MOA with CCI Std Velocity, which is pretty inexpensive. Each rifle will be different though...
Have briefly handled a CZ and they are much nicer. The 455 American has a thinner barrel, so expect it to heat up and wander quicker than a heavier barrel in longer strings of fire. An apples to apples comparison would be the TRR-SR to the 455 Varmint.
Savages are, in my experience (rimfire and centrefire), capable of comparable accuracy to other higher end offerings, but lack refinement. I had a Savage 308 Win and moved to Tikka and haven't looked back. If you think that you will prefer a smoother action, better made etc, then skip the Savage.