When I lived in the South East and conditions got slushy, muddy and clay-like I subscribed to the idea of the narrower the better…..it does work, they cut through the mud to harder terrain underneath….but wide tyres with moto style knobs also work, the widely spaced tread spits out mud and they clear easily….they also seem to float across the gloop better in my opinion.
Now I live in rocky Wales tyre choice is simpler, I can keep high-rollers on all year….or use a minion front….or if there is a little mud I have a magic mary that does the trick too….new/old FS is being refreshed and rebuilt this winter with a shorty on the front, I’ll give my opinion when it’s finished!