I wasn't tryng to suggest that you didn't know what they use; it was more part of a thought process for me. Anyway, you're right that all of those pickups will work to a greater or lesser extent and to a degree, it may depend on the era of Maiden on which you choose to focus. The Super Distortion will obviously nail their tone. The Holydiver will lend itself more to their smoother material in the mid to late 80s, as will the JB, albeit less successfully, while the Aftermath has that general Adrian Smith vibe of the Super Distortion while being a little drier and tighter. Of this lot (Aftermath is the only one of which I have no direct personal experience) I'd say the Nailbomb is least like Maiden but it will do 90s Thrash better than the others if that's what you want. You pay your money, you take your choice and all are good at what they do :D
Out of interest, Adrian is my favourite guitarist in Maiden and has been since he joined. If I could choose to model my playing on one of them, it would be him without a doubt. As far as the bridge pickup is concerned, like you I prefer Adrian's tone but on the neck pickup I prefer Dave Murray's tone.