I would opt for each of those different mount types for different rifles used for different things, but I doubt you'd see a difference in accuracy unless one weren't mounted properly. I like the 1-piece mounts a lot, especially since you can get them with a cant for long range shooting, but for typical hunting it just isn't necessary and it ads a little weight.
I don't know how talley is these days. I used to think of them as being really cheap, but maybe they have some good stuff now. I don't like to skimp on the rings and mounts.