Water cooled (WC  ) has an advantage that you can get more performance out of an engine per cc, compared with air cooled (AC).
But this should not be a major consideration for a touring/adventure bike.
WC add extra weight, extra complication & extra fragility
AC will be more tolerant to high temps, as a WC engine will boil over... and after all, a WC motor needs AIR to cool it anyhow
Although I suppose you can make a quick cuppa a bit easier when you finish you trip with a WC bike
Pays yer money & makes yer choice.
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