You can play around with money, versatility, sound quality, shows.
If you have an unlimited data plan listening to online radio is one way. You have access to the world
XM might have an App cheaper than a device+ subscription.
YouTube has audiobooks, old radio shows, music albums and hours of soft music to read, relax, sleep to.
Using your radios it can be fun to find and listen to near and far stations, keep a log.
Ham radio with an easy to get Tech lic and an inexpensive Chinese handheld can be another hobby not taking much space in your vehicle.
Many good Old Time Radio podcasts. I enjoy “The Great Detectives of Old Time Radio” by Adam Graham (there is an App for it also. I use it as it is easy)
For westerns -Old Time Radio Westerns- has some good shows with better than average sound quality.
As far as unlimited data look at the threads on Visible. It is a Verizon company. It’s prepaid and unlimited everything running from a flat $40 to as low as $25 if you join a party(?) And it includes a Hotspot (unlimited). Coverage is typical Verizon prepaid so just like StraightTalk, Trac, Red Pocket ... no roaming coverage. We’ve used the hotspot to run the TV for Netflix shows in very rural areas with low speed. Works well as long as the connection doesn’t cut