Quickleaf
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For me it's a question of structured social scenes (e.g. parlay, court room, tense negotiation over peace treaty) VS unstructured social scenes (uh...everything else).
The former generally are where I attach mechanics. Though I do have sections, for example, where I'll write "in parlaying with the baron, if a player gives a good response to this question leveraging the baron's RP traits, that can earn an automatic success in the skill challenge."
The later is where it's a lot more freewheeling.
So they're not mutually exclusive, but that's the general trend I've adopted when I DM.
EDIT: Structure often (but not always) corresponds to narrative weight / importance to the main quest.
The former generally are where I attach mechanics. Though I do have sections, for example, where I'll write "in parlaying with the baron, if a player gives a good response to this question leveraging the baron's RP traits, that can earn an automatic success in the skill challenge."
The later is where it's a lot more freewheeling.
So they're not mutually exclusive, but that's the general trend I've adopted when I DM.
EDIT: Structure often (but not always) corresponds to narrative weight / importance to the main quest.