The size of your garden plays a big part in the answer, is it all lawn or do you have rough areas? Also, does your present state of health allow you to push a mower, even an electric and what is the state of your land? Is it sloping? Does it have lots of undulations? How often do you cut the grass?
If you are fit and want to remain fit sometimes using a push mower, often called hand propelled, is best, especially on flat, medium sized lawns. There are some larger 50/53cm cut push mowers available for those who feel the good from the exercise moving at your own speed as you easily manouevere around obstacles.
The more recent introduction of larger battery cordless mowers has made the choice of mower even more interesting.
By far the biggest sellers are self propelled mowers normally used in larger lawns or multiple grass areas especially if undulations or slopes up to 30 degrees have to be negotiated.
The stop start operation of self propelled mowers is easily controlled using the ‘dead man’s’ lever or bale. When the lever/bale is pulled back the mower transmission is put into forward motion and when the lever is released the machine will stop. Very simple but safe for the operator and anybody who may be in the vicinity of the mower being used if the machine needs to be stopped in emergency.
Some machines come with infinitely variable speed control which means the operator can choose the speed in which they wish to travel whilst the machine continues to cut the grass efficiently.