Renden Theme Membership Plugin

Hi there, could I ask, I want to set up a membership site with this website (which runs the renden theme) is there any particular plugin that is going to work better with the Renden theme than another, it’s all quite mind blowing the choices there are, especially for a non-techie!

So I thought I would check with you as to any limitations I might come up against using any particular one over another, the front runners all seem fairly similar, although a few variations in cost.

Many thanks again for your help, much appreciated
Michelle