Your first decision needs to be either gas or electric then you can decide models. If you are looking for dependablity, less maintenance and a engine you don’t have to pull start then electric may be good for you. However electric won’t be as powerful as gas engines so cutting tall grass will be a problem and you have to drag around a power cord.
Gas powered self propelled mower are physically harder to start, needs more maintenance and more costly to run. Gas mowers are much more powerful and will cut tall grass.