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It doesn't matter if it's only a few degrees off horizontal. In more extreme cases, use jackstands. If you have a ski slope driveway, find a better place to work.
If you place the jackstands correctly, I don't see how ramps are better at all. Also, if you car is lowered any signifigant amount, ramps won't work. Your front bumper will hit the ramp way before your wheel does & it'll just push it accross the floor....