That's precisely the discussion that's currently going down in the Windows Central forums, regarding the brand spanking new Microsoft Surface Pro.
In theory, the differences shouldn't be that big looking at the same tasks on the two different models. The Core i7 version has a little more horsepower so it can take on more intensive workloads, and in turn, will then use more battery.
Both offer good battery life, but as the reviews have only just dropped, there aren't many real-world comparisons to draw on when it comes to the new Surface Pro. If you've got some words of wisdom to offer, hit the link below, jump into the forum thread and join the discussion!
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Richard Devine is a Managing Editor at Windows Central with over a decade of experience. A former Project Manager and long-term tech addict, he joined Mobile Nations in 2011 and has been found on Android Central and iMore as well as Windows Central. Currently, you'll find him steering the site's coverage of all manner of PC hardware and reviews. Find him on Mastodon at mstdn.social/@richdevine