Most likely you would want to take the minibus, since even though the big old school buses (chicken buses) will save you a buck or two since they are cheaper, the market you get dropped off at in Managua, and the market you have to leave from are across town, which will cost you more for a taxi to get between.
If you take the minibus, when you get to Managua you will already be in the terminal to grab a minibus to Granada.
As was already mentioned, the total cost of the trip will be around 3 bucks.Edited: 06 April 2016, 15:24
-:- Message from TripAdvisor staff -:-
This topic has been closed to new posts due to inactivity. We hope you'll join the conversation by posting to an open topic or starting a new one.
To review the TripAdvisor Forums Posting Guidelines, please follow this link: http://www.tripadvisor.com/pages/forums_posting_guidelines.html
We remove posts that do not follow our posting guidelines, and we reserve the right to remove any post for any reason.