The more I think about it, the more I reach the conclusion the main reason I always wanted stock was because of that performance boost.
But once that honeymoon period is over, the nice additions from sense or touchwiz start making me want to go back to a skinned device.
Now touchwiz has become more bloated now, but last year when I bought the s3 it was quite clean and light atleast in my experience. JB was already out on galaxy nexus however the same issues as before, camera, LTE, storage, battery, software features, made me skip it and get the s3. I remember using it for full three months and never even rooted it, just nova. And the phone was delightful to use, except I could never get comfortable with an AMOLED screen. That screen actually pushed me to get an iPhone 5, everything else was perfect.
Today it's the same dilemma and we are at the exact same spot except the fact that there is a google edition gs4 now. But if the camera is degraded, it will be a tough buy for me.
I just wish Samsung had worked on further cleaning touchwiz instead of making a U turn to pre-ICS era and add a lot more bloat which is not very well thought. That is probably the reason I started hating them, I had high hopes for s4 using a lighter skin with more cohesive and refined elements but it stayed the same and added more. That is why htc is on radar, their sense 5 is actually what touchwiz aimed last year....
I hope Samsung will come to its senses by the note 3, but if sales are still strong and they think they don't have to do any spring cleaning, it will get worse. This is the time for moto, lg, Sony, htc to take advantage and shine. Stock or not, all they need is a lighter skin that doesn't kill performance, a good camera, and tons of marketing.