Immediately restarting will maximize XP+Legends /time
Full clearing maximizes XP+Legends /keystone
The former is higher efficiency and so the more common practice among experienced/dedicated/serious players.
For me that's not how it works. I almost never get a legendary from the RG, and i'll be lucky to get 1 legendary before killing him. If I fully clear, I end up with at least 5 legendaries (most of the time). My best was like 8 or 9 with a full clear. It would take me at least 5 runs of ending after the RG to get the same amount. Not exactly maximizing anything there.
Oh, and the "experienced/dedicated/serious" players I play with fully clear rifts...
For me it isn't because of the rift keystones. It's the fact that most of my legendaries drop after I kill the rift guardian. Doing rifts up to the rift guardian, i'll be lucky to get 2 or 3 legendaries, as opposed to 5-8 if I clear the rift.
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Oh, and the "experienced/dedicated/serious" players I play with fully clear rifts...
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