My '72 Vega had no computers. I don’t believe my '76 Corolla did either.
The “best” of the purely mechanical cars is open to interpretation. From a musclecar standpoint, I’ve always liked the early '70s Camaro Z28s and Trans Ams. The two cars that had the most impact on the automotive world would have to be the Model T and the VW Beetle. The Model T made cars available to the working masses and established the stardardized-parts production line model, replacing the horse. The VW Beetle again made cars available to the working class as a cheap, basic mode of transportation.
I always liked the MGT series. They started the sports car segment here in the U.S. when countless G.I.s brought them home from Europe at the end of WWII, but they could certainly not be considered reliable or advanced.