A car is close to essential in Reunion Island: public transport is limited outside the west coast, the roads climb steeply into the highlands and activities are genuinely far apart. Three main options are available depending on how long you're staying: short-term rental (a tourist trip), LLD or LOA (1-5 years), buying used (a long-term move of 4 years or more).
This page compares the four options in a detailed table, gives LLD prices by vehicle category (city car, compact, SUV, van), the six criteria for choosing well, and the operators active on the island. To compare rates directly, see for example the Reunion Island long-term rental catalogue from System Lease, which offers several vehicle ranges and packages suited to the local market.