Agitator
I actually prefer the straight vane agitator to the dual action, it always seemed like growing up that the dual action encouraged overloading, since the screw type type action of it would keep even a stuffed load in motion, unfortunately it will also damage clothing in a stuffed load. Straight vanes must be loaded a little light compared to dual actions, but they do a great job cleaning.
That's a pretty good little set, my grandmothers set like it with the 27 inch washer and dual action agitator purchased in 1989 worked for 20 years without fail, and was sold when she redecorated. I purchased an identical washer by itself for my mother 12 years ago at a yard sale for 35 dollars to replace her 1970s GE filter flow after it suffered catastrophic failure. Again, mom is still using hers today.
One thing I can say for kenmore appliances, they last forever, most people seem to replace them Because they are tired of them, rather than because of the appliance wearing out.