To be honest, I chose MyHeritage because it was the most popular one and its price was cheapier than others. I like the interface of their website and the musics they make you listen while displaying the results :)
I think they have insufficient component amount. For instance, all Turkish, Georgian, Armenian, Azerbaijani, Persian and Kurdish people get mostly West Asian component in their results but these nations are not that similar to each other. For example, they could have a component called 'Anatolian' for the Turkish people and same thing can be applied for the other nations too. Most of MyHeritage clients are using GEDMatch because of this situation.