Earlier quoted context omitted.
There is pretty much zero risk if the car is either jacked correctly or put on ramps correctly. Dummies that rely on a single 1.5mm o-ring not blowing out on their hydraulic floor jacks are gambling with their life. Always operate on flat terrain, always chock the wheels, always use the parking brake, always use jack stands, always verify no movement in the vehicle by rocking it, never rely on the floor jack.
Ramps are very good. I don't know why anyone would use a jack for an oil change...
Ramps are nice, provided you don't need to take a wheel off, then you're using jackstands anyway, so, if you're buying one or the other, jackstands are a good option.
Personally, if you have the space for it, a trench is the best option, I had one previously and I miss it alot. Nothing leaves the ground, car just pulls in and is ready to go. Mine was like 2ft deep, so, maybe a little cramped, but very comfortable once you're in there working. You couldn't make a standable trench at home without engineering it anyway, so, a crawlable trench is really the way to go.