I guess I can't add anything new to the poll.
In going to Aruba for 20 years, we have used a variety of rental agencies.
Of course, some have been used more than once.

1. Econo...I think we used them the most. Variable fleet, good service.
2. Economy...a few times. Their price for a Corolla was good (when we wanted a little larger car), their price for a Yaris was just so-so.
3. Tropic...just once. Good, but some mix-ups in pick-up and drop-off arrangements just left us going back to Econo.
4. Hertz...only once -- many, many years ago, our first trip.
5. TRAC (Toyota Rentacar)...used them a few times because they have an office kiosk at our timeshare.
6. Optima...next week will be our first "official" time. Chose them because of rates and their off-site services at the airport. I suspect that Hans of Tropic has a working relationship with Optima because when we used Tropic we had a car labeled with the Optima name (for part of the rental time). It was nearly new and worked very well.

Can't think of any others.