While previous studies have investigated the productivity of the better construction (in the forms had better, ’d better and better) in British and US English (USE), to present knowledge, no large-scale comparisons on the use of this construction in other English dialects have been carried out. The present paper aims to address the existing research gap by exploring the synchronic use and grammaticalization rate of better in 20 world Englishes. The analysis of corpus data reveals that better is more grammaticalized in USE than in British English, and even more in Singapore English (SgE) data, where the construction seems to be more grammaticalized than in any other dialect. The hypothesis of a functional need in SgE for deontic better is tested. It is shown why SgE ‘needs’ alternative deontic constructions in a modal system where (semi-)modals of necessity have been shown to express higher rates of ‘dynamic’ modality than in other dialects. The substrate reinforcement from a parallel construction in Mandarin is presented as a potential driving factor justifying the selection of better as a deontic marker in this particular variety.