This study investigates the effects of lexical complexity on the choice of dative alternants in English and Dutch. The lexical complexity of a given word is operationalized as being proportional to how quickly speakers can retrieve it from their mental lexicon, for which I consult the databases of recent megastudies (Keuleers, Diependaele, and Brysbaert 2010: 1). Following the Complexity Principle (Rohdenburg 1996), which states that cognitively complex environments favour the grammatically more explicit variant in linguistic alternations, it could be expected that lexically complex environments favour prepositional datives. However, the models suggest that speakers’ choices are not particularly sensitive to the complexity of larger linguistic environments. Instead speakers aim to place the lexically easier constituent before the more complex one. This turns out to be one of the strongest predictors in both languages.