Having had wheeled and tracked excavators (2 to 11 tonnes) - if you need to go off-road, you need tracks. If it's hilly, you need tracks. Wheeled ones are *wonderful* for doing little jobs all around the place, but you must have a decent surface to work from (stone/paved, flat). The slightest incline can be terrifying.
Many wheeled diggers don't have true 4x4, so get stuck easily. I've done it. Tracked diggers will slowly make a mess of your stone/gravel areas, whenever you turn. But you probably won't ever get stuck.
Stability is definitely definitely better with tracked diggers. They are much easier to use; fewer buttons, less wobble/inertia, greater safe lifting capacity. For digging, you'll always have the dozer down and ideally some struts; whereas with a tracked machine you often don't need to.
I can see a market for a small 3-5 tonne wheeled excavator to have as a backup to a bigger tracked digger.
(OP, that Aliexpress link seems to go to an "assistant device" - clicking the more-likely model name doubles the price).