BitShares - the worlds first decentralized autonomous cooperative governed entirely by the stakeholders to facilitate an efficient and profitable businesses.
BitShares X has too many syllables and does not roll off the tong. It is confusing to everyone I tell about it.
BitShares is simple, unified, and captures what it is without extra overhead or the need to explain more. It is easy to say, spell, and use. It parallels Bitcoin nicely.
X sounds eXtreme or "over hyped" or "advanced" or some other feeling that people don't get or like.