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Don't think of what will look better in a B School application, think what is best for you, your goals, your future, financial situation etc. If you are passionate about TFA go for it, just make sure you don't do it just because you think it will look good in an application, if that's the case those three years will feel very long.
TFA graduates do very well in the admissions process. Just realize that there are quite a few applying to top MBA programs so there might be some competition. Working for a federal agency is a bit more unique from an admissions perspective and there are fewer candidates applying with this direct background. So, it might be easier to distinguish yourself if you take this position. Either way you really can't lose -- as both are great options.
Both are great options, congrats!! To do TFA I would hope you actually want to teach. I know many many people who are in or who have done it and It's great if that's what you want to do. If you have any doubts, I would be hesitant to take the offer. That's a legitimate 2 year commitment, whereas if you take an office job, for most places you can leave right away and it won't affect you much in the grand scheme of things.
Bottom line though -- do what you think you'll be happy at. Don't strategize the job search based on grad school aspirations that may or may not materialize.