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What would be the best practice area which makes it easy to transition to In house from law firms say after 2PQE or more? Gen Corp?
From an inhouse exit POV, go for - Banking and Finance, Tax, General Corporate, TMT/IPR.

Avoid Capmarks, Projects, Funds/PE, Employment and other niche practices.
But most GC teams specialise in some sort of PE or M&A also. Is that fine?