I once have this dilemma back when I was trying to create an online store. Basically a developer explained it well to me that If you are trying to create simply blog, classified ads or anyting, you can simply use wordpress becuase its the best software ever thats free. But if you are creating an ecommerce site, use the one thats right for it.
He explains that some of the plugins use to convert wordpress into something different might not work to future updates of the wordpress version. My suggestion is to check whether this is a possibility to whatever you wanted to do to your wordpress.