What's the best scriptwriting program? What's the best sitcom format?

Back from Dallas where it's not 112. Travelogue to follow next week. Here are some Friday questions asked while I was away.
Purplejilly gets us going:

What do you think about script writing software? Do you use it nowadays? I've heard several people make comments like 'don't even bother to write a script if you aren't using XXX brand softwriting script and know it inside and out.' What's

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