The U Lite seems like a better option than the U1 as it has a larger 100mm fan compared to the 80mm fan of the U1. It'll provide more airflow and therefore better cooling than the U1, and it also supports slightly larger laptops (up to 15" models vs up to 14" for the U1). If the price difference isn't large wherever you plan on buying from, then I'd say go for the U lite.