Kitchen Upgrade

[port1042]

I'm redoing my kitchen including replacing and relocating the wiring in most of it. I'm putting two outlets under the sink for the dishwasher and disposal. According the installation instructions these can be either 15amp or 20amp dedicated circuits. The run for each outlet will be less than 10 feet from the panel in the basement right below. Would it make any sense, other then a minor cost difference, to put in 15amp circuits? Both outlets will be dedicated and i'm mounting single outlets at each location.