Rent or buy video games?

My boyfriend and I plan to get a PS4 after the holidays. We will split the cost together.

We both are the sort to finish games and not pick them up again when done. Except for a few games with a lot of replay value, like GTA or Call of Duty, well, most don’t get played a ton when done.

What are your thoughts on using a game rental service? For about $20/month, we could have 2 games out at a time through Game fly. I have used that service before and it’s fast and good where I live.

Or is it better to buy games and then sell or trade in? Or rent and then if I really, really, really like a game, I can buy it?