Like I said, I only see Malon getting really angry when he'd be irresponsible - like Talon - which I doubt he would. (Or when he goes off without saying a word - which I doubt as well.)
I know that ruling a kingdom is much work - but since Hyrule is in a time of peace - or should be - I suppose he'd find occasonally the time to go out (he could also say it's for diplomatic reasons and visit Darunia and King Zora/Ruto - they are the leaders of their people, after all.)
He'd also find time when living on the ranch or in the town (well, the town would actually be more convenient, since he can get to the castle faster if ever something happens and Zelda needs his help as quick as possible).
I just think - disregarding any romantic issues - that the castle is the most convenient - he's at Zelda's side most of the time if she needs protection, he can actively help making decisions for the well-being of Hyrule and it's people, he has no additional work to his work at the castle - ranch, a shop in town, whatever else there might be - he's with his wife (and maybe his kids) while doing his hero duties.
(And Link is smart so he'd gett the basics of the protocol pretty quick I think - but of course he'd have to spent some time learning it - but I suppose, considering Links limited knowledge of the Hylian lifestule, he'd have something to learn no matter who he chooses.)
Not disregarding any romantic issues - this whole discussion won't matter anyway, since Link will just choose whoever he loves and pursue to be with that person.

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Being a knight isn't a simple appointment... It's the pride of how you live!
I'm not as cheap as you guys say I am.
Don't underestimate me.
-Raven