Front, Side, & Top Loading
H-Axis washing machines have long dominated the commercial laundry market, leaving aside laundromats for a good reasons.
Capacity, gentleness of wash action, and ability to do more wash with less water than a top loading washing machine with a central beater.
Indeed once one goes about washing machines rated for say 25lbs, you aren't going to find a top loader, certianly not one for 100lbs of laundry or more.
Top loading washing machines, later automatic top loading washing machines came to dominate the American market for several reasons.
In the early days of washing machines, there were all sorts, including tumblers (like the Thor washer in another member's post), and wringers. What all these machines had in common was the fact none spun laundry dry. In a commercial laundry workers unloaded the washers into extractors, but that was neither practical nor safe for wide household use. So women dealt with wringers, automated and hand crank.
Meanwhile Bendix was at work on their front loader, and due to their work and patents, no other manufacturer could build nor improve upon the design for their own use without paying royalties, if Bendix allowed it at all. Front loaders then only tumbled in one direction, causing Madame's laundry to emerge often in one tangled mess. Indeed these machines were nicknamed the "rope maker".
Since Bendix had the front load market tied up, American laundry makers continued to innovate and develop the top loading model. These machines gave acceptable results for most American housewives, especially when coupled with the ample supply of hot to very hot water from the taps, and chlorine bleach used for stain removal and whitening.
What is also important to remember top loading washing machines were a natural evolution from the way most women did laundry; that is in a tub using a dolly stick to "agitate" the wash water.