Actually because of the defaults set in BU it is more likely to follow the longest chain regardless of what the blocksize will be. Therefore it can be argued that BU is better for end users since if they where using Core instead they would be forked off the network when the blocksize is increased. BU allows for continued compatibility with the Bitcoin blockchain regardless of what blocksize proposal is adopted, unlike both XT and Core which will need to be upgraded and or patched in order to maintain consensus with the economic majority depending on the blocksize proposal that is chosen. Bitcoin Unlimited on the other hand maintains compatibility with other proposals out of the box from day one using the default settings.