Any recommendations one over the other?
Depends what you're looking for.
If you want a new(ish) car similar to any of the big rental agencies, I've had good experiences with J4W and Ari's, haven't tried Swifty. Both of those have pretty new Camrys/Altimas, Sentras, some Kia SUVs, minivans, etc... You can call the 3 of them to compare prices.
If you're willing to take an older car, Ari's and Swifty both have some older (sometimes high-mileage and maybe not completely scratch-free) cars that they'll give you for cheaper If you want. Idk if Just Four Wheels has such a thing.
It depends if you want a new car or the absolute lowest price possible....