~に越したことはない (can't go wrong with)

A fixed idiomatic frame [verb dictionary form]に越したことはない, literally '[there is] nothing that surpasses X,' meaning 'nothing is better than X,' 'you can't go wrong with X,' 'you can never have too much of X.' Common collocations: 用心するに越したことはない, 安いに越したことはない.