Having lived in and worked both areas, I can offer the following:
*both units are east slope of the cascades and both offer a mixture of muleys and blacktails. I would say the blacktail influence is heavier in the Keno unit than the White-River Unit.
*The Keno Unit is a mixture of resident and migrating deer. However the migrating deer often originate within the unit. The migration is generally southward bound.
*The Keno Unit is flatter than the White River Unit.
*The Keno Unit is generally heavier covered in the winter area than the White River Unit.
*Keno has lots of logging roads, some of which are now closed off, but access is easy. Much of the private land is a timber company called JWTR. Open to hunt, just respect their rules.
The hunt has its devoted followers but it is not anything to write home about. I think it may be gradually getting better. I personally would not waste a point on it, but that is me.
Side note:
I had a late season Warner Muzzleloader tag several years back. I was traveling to the Warners to scout. However when I went home (then in The Dalles) I would find just gagger bucks in the White River Unit. I honestly never saw better bucks in the Warners than I did in White River that year. The best Warner buck was a stubby horned 3x4 32" buck. Score-wise he was easily beat by several heavy-horned bench-leg bucks I saw in WR. WOW.