which it should be...
12 has more factorals than 10, so you would get repeating decimals far less often.
I can divide a circle into 12 equal parts fairly well freehand, but dividing a circle into 10 equal parts is hard even with a protractor.
I suspect that there was once a base-12 numbering system in some southern European culture, as several languages (Greek, English, French, Spanish) have different words for 11 and 12 (OK, so Spanish has different words for 13&14 also, and French for 15&16), and they are not referred to as tendyone or oneteen