SegWit can revitalize Bitcoin while Bitcoin Unlimited can only create another wall between users.
You don't believe it? Just check up what is happening to Litecoin, they are on a brink of SegWit's activation.
The price of LTC is soaring, media attention is higher than ever and community is positively thrilled.

http://litecoinblockhalf.com/segwit.php Litecoin is only ~6% away from a major breakthrough.