with all due respect to all that awesomeness...  My outsider take is:

Bitcoin itself is too slow for many point of sale situations but always has the advantage of being more likely to hold it's value over other fast but volatile alt coins.  

Bitcoinplus is super fast and offers the promise of value-stability due to the small number of coins.

Bitcoin has serious future issues to overcome with the expense of POW and no possibility of an increase in the number of BTC in existence. (the problem there is BTC may become too valuable to spend but the expensive network needs transactions to survive)

Bitcoinplus is POS now so the cost to support the XBC network is significantly less than BTC's network. The supply of XBC will grow moderately over time - hopefully in alignment with adoption.

Those advantages really matter, but yes other coins have the features (pretty much anyway, XBC has an amazingly small number of coins).  Bitcoinplus, however, can be more easily marketed with those features because it can be branded as the fast cousin of BTC due to the name similarity.    

With all due respect to Mr. Shakespeare this may well be a situation where there is really something special in the name;  the 'plus' is really relevant and should be easy to communicate over time.