Petrol mowers are great for convenience, particularly if you've got a big area to mow where electric cables are a problem. The Honda ones are superb, but I used a cheap plastic one with a Briggs & Stratton motor that I bought 2nd hand for £30 for 3 years without any problems. Note that with a petrol mower you'll probably need to store it horizontal to stop fluids ending up in the wrong places.
However, as commented above, electric is more 'green', although maybe not if it has a Li-Ion battery pack 😀 Clearly you can store these at any angle.
We now have two Qualcast Panther 30 push mowers – one at home for our modest lawn, and one at the allotment. Although they're probably not the best quality push mowers they are cheap (£35ish new, plenty on eBay that have only been used a couple of times) and work fine. It also takes up minimal space in the shed/gareage. To be honest mowing with one of these doesn't take much longer than a powered mower for a small lawn, and there's no issue with petrol/power cables etc.