I've seen more bikes fall over with kickstands than just leaning them... when you lean it, you're going to be watching what you're doing and how steady it is... with a kickstand, you take things for granted and then next thing you know the bike has slammed down on it's side (usually from uneven pavement, a strong breeze, meteor showers, etc.).. stick with leaning it correctly.. If there's no place to lean it, then get on it and ride until you find someplace to do so