I use both. I pay for Pandora, and use the free version of Spotify. With one touch of Pandora, my system will stream many hours music from a few dozen stations I've created.
I love it.
With Spotify, I've not been able to make it work like that. Like having the "Bob's radio station" like on Pandora. Like Carl, I just don't understand Spotify. Maybe there's no way to make it work like Pandora, maybe you only get that when you pay for it.
If they get out of hand, or make it a pain in the butt, I'll just use the free version of both.
Let them suck those eggs.
Bob