The stretch on Highway 77 from Holbrook through Snowflake/Taylor and into Showlow is fairly straight and predictable. From Holbrook south into Snowflake can be a lonely drive as their is nothing immediate to witness aside from distant thunder clouds particularly late in the afternoon as the sky can be soo dramatic. If your not in a hurry, you could find yourself in a row of vehicles behind a big rig or an RV.
Once your into Showlow and out particularly continuing on 77, it is not for another estimated 30 miles before you begin to come across windy roads, declines and inclines. This is just before you reach Highway 73 (Fort Apache/WhiteRIver Road). After which, and through Carizzo, AZ, the road begin to twist and turn, HOWEVER, it is compensated with nice views. Traffic can be slow at times particularly again if your caught behind an RV or a big rig.
Once your through the Salt River Canyon, the roads will not be as windy. In summary, the highway between Showlow and Globe is very scenic and worthwhile if you can stand certain portions that are windy and some slow traffic.
Otherwise, on highway 377 into and through Payson, the flow of roads is fairly predictable but again, particularly below the Mogollon Rim, the roads can be windy, yet there are 4-lane roads below most of the way into Payson, traffic will be somewhat slow, just before your reach Payson. Once into and out of Payson, the roads are 4-lanes into Paradise Valley/Scottsdale. Traffic can be fairly fast leaving Payson. Of course, the time to reach Scottsdale will be much more faster too.