I've worked with my client in the past and only recently some problems appeared and I started to work again on some things. Meanwhile they have created a mobile version of their website, but unfortunately they created two different designs instead of choosing a responsive design.
This decision was taken because the mobile version was considered "not good enough as a desktop option". I'd like to convince my client to reconsider this and in fact work out a responsive version of the website.
When I google "why responsive" I get some great results, but I'm not sure if sending some links will cut it in this case (most links are specifically about responsive vs. non-responsive, not responsive vs. different mobile/desktop site).
Any suggestions on how to approach this?