In general, most rental car agencies offer similar vehicles in various classifications. The number of categories has increased over the last couple of decades. The era of simple choices between subcompact, compact, mid-size and sports cars is over. Now your options might include everything from mini cars to luxury SUVs.
What is it that you need? A luxury car might sound nice, but if you're not spending a lot of time in the vehicle, it may be a wasted expense. You might be tempted to rent a convertible, but if the weather isn't nice or you have a lot of luggage, it's not the most practical choice. An honest examination of what you'll need while on your trip will help guide your choices.
The earlier you determine what you need from your rental car, the more flexibility you'll have when shopping around for the right deal.