I know I'm in the minority on this subject but I like the DePalm shuttle. It's comfortable and the driver usually adds some commentary along the way so if it's your first visit you can get an idea where things are. Of course we travel during week so we are generally not dealing with a crowd when dropped off at the resort. Price wise, for us, it works out the same as a taxi. Prices for Depalm are $20 per person but that is round trip so it ends up being $20 for the trip each way basically the same as a taxi. If there were more of us or I was staying in the High rise area I would opt for the taxi simply because it would be quicker. We stay at the Divi which is generally the first or second stop.
Took the bus our first trip and it was informative and gave us a perspective of what's where..... but took some time that would have been better spent on the beach. Always do the taxi now..... quicker to check in and get to the celebratory Aruba Ariba on the beach!