Bitcoin Diamond is the best fork of Bitcoin. Lightning network will be deployed by June 2018.
Size per block is 8 times higher than Bitcoin which ensures faster transactions, simultaneously.
Cost of transaction is heavily reduced as well, later tests concluded with $0.03-$0.12/transaction.
The price of Bitcoin Diamond as an investment is at the time of writing averaging $5.5/BCD ($30-$50 on some exchanges due to wallets locked, limited supply)
Bitcoin Diamond is the "Better Bitcoin", has a great team of developers and a bright future.
Recent partnerships and engagements show a strong trend of becoming better continuously.
It is very likely that Bitcoin Diamond will dominate the market with a higher market capitalisation than Bitcoin.