Listing multiple phone models in one listing?

[WildWekaDesigns]

Hi,
I would love some advice on this. I currently make phone covers for the iPhone 5 and 6 but I can easily make covers for some of the other popular smartphone brands and models. My question is, is it better to have a new listing for each type of phone and maybe include colour variations, or should I have a list of phones that the buyer can choose from in a single listing?
I would appreciate any advice or tips!
Many thanks,
Esta

[PawsomeCrochet]

I ended up splitting most of my items that were similar. I still have a few (custom products) that I grouped with color variations. But I've decided to split listings where I can. I figure that having separate listings may increase visibility and allow me to use more tags.