From the discussions I've had with people who know lots more than me, the drift seems to be toward skinnier/higher profile for general road and sandy off-road performance. Thin but long is better in sand than fat and wide...
The rationale given centres around a higher-profile (80% upwards) which grows proportionately more length when deflated, than low-profile/wider.
As has been mentioned 'Length' is more useful in sand that steam-roller width.
I'm currently running the traditional 235/70 R16 on my Classic. Identical rolling radius to the 'Recommended' 205 R - 16 which are 82%.
These tyres are past their use-by date, and I'm sorely tempted to go for 225/75 R16 simply 'cos I've got 3 useable ones on rims as spares, and this would standard-ise for both work and playtime.

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