Older is always better. Is your Whirlpool a tall tub or a standard tub? If it's the standard, it's most likely a PowerClean, and in that case don't EVER get rid of it until it all but dissolves into dust, but with common sense and good care that should never happen. If it's a tall tub, you're still in good shape, as they are still phenomenal performers, though slightly less powerful than the PowerClean and they take a little longer. If you post some pictures, that will give us a better idea.
The new Maytag is a great machine in comparison to what's on the sales floors now. They were revamped in the middle of this year. The pre-2014 models used the Point Voyager platform, the same that the Whirlpool/KitchenAid/Kenmore machines are built on with anything before this new “HE” version. The difference between the Maytags and its sisters was that while it used the same motor/pump/basically everything as the WP/KM/KA’s, the computer managed time, water, and heat more efficiently. It purges heavy soil from the accumulator while washing without having to do a complete water change, so that if dishes aren’t dirty enough to really need a prewash, it turns the initial fill into the main wash. The hard food disposal is also a four blade chopper rather than two.
The newest version has been updated to use the same “plumbing” inside as the new WP/KA/KM resource-saver models, such as the pump location, the pump assembly, and the supply tubes to the upper rack, but they removed the flow diverter, meaning all arms are powered at once, and they added an accumulator filter in place of the manual filter along with keeping the four-blade chopper, which means that the pulverized debris is pulled out the drain during the mid-wash purges and during the drain itself. The wash arms have smaller diameter spray holes, but the motor is still a full-sized ~1/3HP motor just like the previous PV model, whereas the new WP built machines use the equivalent of what the drain pump motor is in a washing machine.