There's a number of considerations, apart from economy: the Prius has an astonishing drag factor (CD) for a car with an exhaust system and water cooling system especially on 15" wheels, which is one reason it's more economical than the much smaller and lighter Yaris Hybrid.
Some people (like me) prefer (even love) the digital instrument layout of the Prius, and all the information it can give you. I've greatly missed the instruments, info and especially Head Up Display since very reluctantly switching the the RAV4 Hybrid.
The Prius is less favoured by taxi firms now, partly because with the Gen 4, despite it being a major improvement in very many ways, lost some features that made it particularly suitable for taxi work: namely, good rear headroom, false boot floor and loads of interior stowage space. The last 2 were appealing because it meant all the bits and prices a taxi driver needed to have handy were out of sight, leaving an uncluttered interior and boot that appeared empty for passenger's luggage. The Gen 4 kept the excellent rear leg room, which previous made the Gen 2 & 3 Prius a better choice than other Toyota Hybrids.
When booking a taxi, I asked them not to send the latest Prius (despite owning one myself until recently) if I was likely to go in the back, because it's uncomfortable being unable to sit upright. Apparently, it was by no means an uncommon request.
It's a shame, because in almost all other respects, save one, it was the best car I've ever had, and in most ways I would much rather have kept it than switch to the RAV4. Many other Gen 4 Prius owners say the same, and like me a lot of them had previously run earlier generations of Prius (all versions in my case).
The one thing that effectively forced me to get rid of the Prius was its very low ride height (part of the method of achieving that super drag factor) which caused me to start have very serious problems with my hips, which started affecting my knees and back as the method I adopted to enter and exit the car to minimise the pain (and shouting!) put great strain on my joints. The problem has completing disappeared in the almost 4 months I've had the RAV.
I even started investigating having an aftermarket air suspension system to be added to the Prius so that I could raise it for getting in and out, but it proved too complex, and meant losing lots of boot space and the spare wheel.