Oh, forgot to say, I always push people to dual radio APs (regardless of kit type).
The amount of times I've worked with a customer with single radio APs, where they've ended up disappointed at their inability to do something I wouldn't like to count.
With dual radios, your flexibility and operational potential is nowhere near as limited. In simple terms, it's massively de-risked. Examples of challenges in this space are client density, imovable spectrum specific constraints (stuff making RF noise that can't be turned off), retaining one frequency for mission critical stuff (voice). Etc. etc. etc.