Board Thread:Questions and Answers/@comment-33033861-20170920162409/@comment-33728484-20170923223513

Whis is really good, but his stuns are rare, and his healing is not really necessary on that team, unless you're doing a really long stage such as Boss Rush... that's because thanks to SSJ4 Vegeta, Super Vegito and Caulifla's passives that team is really good at not taking damage. However, your SSB Goku is not dokkan awakened yet, which means that at the moment Whis links better with SSJ4 Vegeta, because SSB Goku doesn't have Prepared for Battle and Fierce Battle yet. So for now you can keep Whis if you want... but after SSJ3 Goku, SSB Goku should be next at being dokkan awakened. His event is the first one on the 2nd stage of Boss Rush, in case you want to test it out.

Also, there's nothing wrong in switching units from time to time, it's a good way to test different options!