I agree with someone above that it comes down to hood ergonomics - how they feel in your hands. Very important since you will be there maybe 40-50%+ of your rides. Also important is how the shifting is accomplished. For me, the thumb levers on Campy are amazing. I know some people who like Campy but the thumb shifters just aren't for them. This is something you really need to try before blindly going to Campy.
Finally, keep in mind that Campy is the least available at most shops. Usually you'll have to order something if you need it fixed. Most shops regularly stock most anything Shimano and SRAM, however. Also, Campy has the highest cost - both to get and to maintain (although on my Record I just get Chorus cassettes, except for the occasional race).
To the last point, I'm still running a 10s Campy drivetrain. I run a Veloce cassette and KMC chain. It shifts fine, is about as durable as Centaur, and the total cost is on par with Shimano 10s Ultegra or 105. And the Veloce cassette doesn't gouge an aluminum freehub body despite being a loose cog cassette. Clear advantage to Campy's freehub spline design (deeper splines). Either way, you're right that many of Campy's consumables are pricier than Shimano's, but IMO, you don't need to use the top-level consumables on either groupset, and I don't think most people will really see a benefit. And I also like the overall modulation of Campy's brakes. I don't need to feel a bunch of power immediately.
OK, all that said, I am also likely to switch to Shimano. I've got small hands, and the lack of adjustability on that score is not pleasing to me. When I started cycling, Shimano was on its 9s groups, and those levers were pretty big, and the lever throws were also big. Campy levers were a big improvement for me. Plus Campy's durability was better than Shimano's.
Now, though, Shimano has adjustable levers, and they cant outwards. Both those features would help me. Campy does neither. Right now, I'm inclined to switch on that score, plus the overall availability of parts and spares. I'm convinced that Campy and Shimano are very close in quality and durability, and therefore it's really down to personal preference between the two.