Fist: Define an Example: I'd say look at 180mm or so size, and a brank like Zakuri for classic profile.
(note this is 210x60mm)
Compared to a deba:
In general, its pointier than a true deba. And it has a normal spine width and proportionate weight to gyuto, unliike most versions of 'deba'.
Compared to a Santoku:
It has a way more useful tip, its taller (>50mm), and It's is a better draw-slicer while still being competent/good push cutter the last 1/3 blade (thanks Deba profile).
Obvious Caveat:
Some santoku profiles can start to merge with Funayuki depending on the example,
so if you have small hands and see a pointy santoku or low heel-height funayuki
then you can go that route...nobody really caress of course
Summary:
Thanks to its deba roots, the Funayuki is more like a gyuto in that its a protein centric knife that also cuts vegtables.