Bitcoin Unlimited is a scam, Segwit and Lightning are supported by the real experts such as Nick Szabo and Andreas Antonopoulos.
https://unenumerated.blogspot.com/2017/02/money-blockchains-and-social-scalability.htmlThese necessary tradeoffs, sacrificing performance in order to achieve the security necessary for independent, seamlessly global, and automated integrity, mean that the Bitcoin blockchain itself cannot possibly come anywhere near Visa transaction-per-second numbers and maintain the automated integrity that creates its distinctive advantages versus these traditional financial systems. Instead, a less trust-minimized peripheral payment network (possibly Lightning ) will be needed to bear a larger number of lower-value bitcoin-denominated transactions than Bitcoin blockchain is capable of, using the Bitcoin blockchain to periodically settle with one high-value transaction batches of peripheral network transactions.
Every day that passes without segwit sectivated = another wasted day to keep innovating and moving forward.