Bitcoin Core was Satoshis implementation of his novel Nakamoto consensus algorithm.
Bitcoin Unlimited is an attempt to utterly destroy Nakamoto Consensus in Bitcoin.
The new bitcoin unlimited implemented without community standards.It developed to destroy the original bitcoin core.Now a days forking affects the bitcoin price,this is the reason bitcoin price decrease a lot and the situation is unstable.This condition very risk for traders and minors.Finally,Bitcoin unlimited is just a diversion not a alternative.