I'm not big into bear hunting, so take this with a grain of salt.
If you're looking for a backcountry sort of deal from what I've heard Northern California is a good bet. High populations and a lot of glassable terrain on public land in the higher elevation wilderness areas.
Eastern Oregon spring bear can provide a similar experience.
Guys in the Oregon coast range seem to do well hunting clear-cuts. Pretty much the entire coast range is covered in an extensive network of logging roads, so if you're looking for the opposite of a backcountry deal that's an option. There's pretty high densities in the coast range. I personally don't like the amount of road access.
This is a totally unqualified hunch, but I'd guess the Cascades (at least in Oregon) would be the toughest option. Little to no logging on federal lands and the glassable terrain is pretty much limited to burns. That said, many of those burns are full of huckleberries that are a huge draw for bears early in the fall season. The Cascades have good numbers, but I've been surprised at how few I've actually laid eyes on since I've been here.
The Washington Cascades, especially as you get further north, have more alpine habitat so it's probably a lot more comparable to the hunting in the Trinity Alps and other Northern California spots.