Two brand new career guides, to very different businesswomen: Sheryl Sandberg and Arianna Huffington. Which is the right one for you?

Lean In for Graduates by Sheryl Sandberg (WH Allen) Out April 10

She says: Updated exclusively for women (and men) just entering the workforce, this new edition of Lean In includes a letter to graduates and six additional chapters from experts offering advice on finding and getting the most out of a first job.

We Say: A brand new edition of Sandberg’s best-selling ode to female office empowerment, this time not focusing on having it all, but, for a generation that fears even getting that first foot on the ladder, having it at all. Expect tips on CV writing, how to ace an interview, negotiating your salary and what to buy Mark Zuckerberg when you're out for after-work drinks. We’re lying about that last one.

Buy For: Your best friend

Thrive: The Third Metric to Redefining Success and Creating a Happier Life by Arianna Huffington (WH Allen) Out now

She says: "To live the lives we truly want and deserve, and not just the lives we settle for, we need a Third Metric, a third measure of success that goes beyond the two metrics of money and power."

We Say: Forget Leaning In, the helmet-haired Huffington Post powerhouse thinks you need to lie down. Don’t let work rule your life - sleep, spirituality, meditation and mindfulness are the key to creating a happy, balanced life. She lives by the rule - The New York HuffPost office has sleep pods for daytime naps. But would you be brave enough to snooze at work? The jury is out...

Buy For: Your boss, if you need a rest.