The mowers you are choosing from are all quality mowers.
The most important thing to consider is where you buy it. When you have problems and trust me, with todays fuels, you will, you want to be able to take it to your dealer, who will get it repaired RIGHT AWAY, because you bought it from him.
If you buy it at a big box store, they will have to send it out to some service center, who knows where or when you will get it back.