For reconciling contradictory canon in a believable way,
Christopher wins hands down.
Watching the Clock in particular, was a masterful job and hugely entertaining.
Unfortunately the conference scene in
Greater Than the Sum, where the different interpretations of the Borg in the episodes, films and novels were all put together, made my eyes glaze over.
DS9forever wrote:

Andy Mangels and Michael A. Martin.
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They get my anti-vote. Their clunky attempts to reconcile ENT with TOS were
awful (the cloaked Romulan ships exploded immediately after "Minefield"? The TOS-era being a technological downgrade from ENT's?)
Judith and Garfield Reeves-Stevens are usually very good at in-universe reconcilliations, but they totally lost it when they tried to explain that phaser technology was somehow lost in the time between Enterprise and TOS in
Collision Course, so Cadet Kirk was forced to use a deadly laser as a weapon because although they were redeveloping phaser technology with it's useful stun settings, it wouldn't be ready for a few years yet.
As for true recons,
The Good That Men Do wasn't much better than the episode it rewrote, IMO. That Soong faked his "Brothers" death according the
Persistence of Memory was quite cheesy but I forgive it for leading to such an engaging story. I haven't read
String Theory yet, but I've heard it rewrites a bit of Voyager, putting "Fury" and some of Janeway's erratic behaviour into a very different perspective.