Well I turned my wellies upside down.
And I turned my walking-on-tarmac shoes upside down.
And wouldn't you know it, they're the same size
Mr Carrington wants us to be serious for a change so I'll try :
Wider tyres = more grip, except in snow, where they're worse, and clearance issues if you go too wide.
Taller profile = more ground clearance, less stable handling and clearance issues if you go too tall.
Bear in mind how tall the vehicle is right now (6' 5.5" if it's a standard D1) and where you park it (e.g. in a 6'6" -limited car park).
A better question would be: MTs, ATs, Winter tyres or road ?
There are sooo many threads on tyres to be found with a search on here that one of our members has altered his avatar to make a point about it ...
Go! Search! Have fun! And when you've made your mind up, let us know how they perform.
Will that do Mr Carrington?