Is there a prefered method to framing an interior wall corner? I am re-finishing my basement and in the process of framing my small bathroom, hallway, small bedroom and living area. Just trying to make sure I do this right. My opinion is that #2 seems to be the best option.
If maximizing insulation in the corner is your number 1 concern, then option 1 (though I'd do it with a strip of 5/8 plywood, rather than clips) is good.
Option 2 (frequently called a california corner) is better in terms of giving easy bearing to drywall.
Option 3 is poor for insulation and doesn't optimize wood use. It's useful in situations where you need a post.