This video clearly shows the benefits of a 'Pull' design front disc mower.

As you can see, the frame holding the mower is designed to pull it rather than push, which not only helps the mower to last longer, but it also does a much better job!

The 'Push' design front mowers are a bit like a bulldozer - pushing the cutterbar into whatever is in its way, with minimal give if hitting into some solid, so a lot more risk of doing a lot more damage than a 'Pull' design mower.

In summary - 'Pull' design mowers are the future, 'Push' is the past.