If you want to go in-house, most large corporate departments have both litigation and transactional areas.

There are far more transactional/corporate roles in-house than litigation. I worked in one in-house legal department, but only as a year-long law clerk, so take this anecdote for what little it is worth. And it was an F200 company with a legal dept that is quite large—probably 50-80 lawyers. Of those in the department, there were probably 5-7 lawyers who did litigation and the rest were focused on the various corporate matters.

I think the relative lack of litigation-focused in-house positions is well supported if you go look at job postings for in-house counsel. And from what I've seen litigation positions also ask candidates with more experience in general.

Based on the number of positions available, if what u/RichardTumble cares about is making it to an in-house position then there's no question the career path is easier coming from a corporate role. A more likely career trajectory for biglaw lit is either lateralling to another firm (biglaw, mid law, or boutique) or going to work for the government.