Which is the difference among a economy vs compact rental car?
At a glance, when you compare a econony vs compact rental car both categories looks very similar, but when you look in depth notes the differences.
The economy is smaller with less power, and less equiped, with less consumpsion of fuel. While the compact has engines with more power, more space for passengers and baggages, and more technology.
In single words, the compact car is the starting point of superior categories.