If for business, kaki. If for leisure, jeans. Because Jeans go with anything are long lasting. Only mexicans wear kakis for leisure and it is not stylish at all. All people of all ages wear jeans but only mexicans wear kakis like i said.
Jeans are the best way to go because you can wear them for about 2 week before they start getting dirty and you can have them for years without them ripping or tearing.
I personally love jeans but I am a 17 year old girl so my taste in pants might be different. When it comes to jeans there are so many different brands and styles you can buy and wear. Also jeans are casual and go with anything. When it comes to Kaki Pants I think this is a little more dressers. For guys kaki's are nice but I personally love guys in jeans.
Depends - for work I wear jeans because sometimes I get on the floor and get dirty - khaki's are harder to get clean. In the warmer months khaki's are nicer looking but in the winter I wear jeans all the time.