Choosing what to say is an integral part of multi-party dialogue, whether to ensure a natural flow, or advance a strategy. This paper presents an argument-based framework for selecting dialogue move types and content. The framework first builds and evaluates arguments in favour of move types and content being preferred, before determining whether or not there is an optimal outcome – where both the move type and content are preferred - or a sub-optimal outcome – where either the type or content is preferred, but not both.