Confused about renewing Subscription (is this a loophole for cheaper subscription?)

I’m coming close to my annual renewal and noticed that in my Apple Store there’s various different prices for what seems to be the same plan. I’ve attached a screen shot.

As a poor grad student I’m trying my best to manage expenses but I’m not sure if this is a loop hole or if the other cheaper plans give me the same benefit of the app I currently have.

Can anyone shed any light on this?