score:3
I've stayed in Aruba for a week in February 2023 and this is my experience.
All taxi drivers must follow the official taxi price list and in my experience all of them did follow it without question. There's no expectation of tipping. All payments are in cash (both USD and florins are accepted), not a single cab I've seen took credit cards.
In my experience the most reliable option was Aruba Taxi Company, reachable at +(297) 587-1300. Two other operators I've tried either had unreasonable wait times or weren't able to supply a cab in the early hours of the morning. Disclaimer: I have no association with this taxi company other than being a customer.
Based on my experience a cab always showed up within 10 minutes of calling the number above.
If you're on the main highway or in the hotel zone, you can hail a cab within a couple of minutes of waiting. Anywhere else you might be waiting for a long time as there aren't that many cabs on the island.
There are a few apps in the App Store claiming to allow for "Uber style" ride hailing but none of them seem to work as of 2023.