I prefer walnut but that’s all up to you as they both will be fine for that rifle. Also since it’s unfinished you can stain it with whatever you please. I’m preparing to do a Hawken build and am using laurel Mountain forge stain and their finish for the first time. All the forums I’ve seen say it’s some good stuff! Boyd’s does a walnut stock too, and eBay may have some stuff for the pre accu 110. I just built one this summer, super fun and came out great with that original stock getting some modifications. Whichever stock you chose, pillar bed it. Glass bed if you want too but you’ll have to pillar bed it. Mine was just 22-250 but there’s just so little wood catching on the middle screw and that one and the front are the only ones holding the rifle in, rear screw does nothing.
Also the grain running through the wrist as Mr. Krewson said is the number one choice but if it doesn’t you can drill a hole and glue a steel rod in. A lot of guys don’t even pay any attention to it and it turns out fine but grain run outs there is a big weak spot.
And lastly, I think the cascade looks better than the rollover. I dunno, it just caught my eye. Hahaha
Boyd’s will checker too if you don’t have the tools or will or know a competent gunsmith. And they do LOP and I think different recoil pads and all that.