I will sell my S3 and then use my HTC One and Note 3. I think I will most of the time use the Note 3, but when I do sports or stuff, I may take my One.
Previously had a Note 1, liked the screen size, but not the battery, cpu performance and screen quality. So I think Note 3 will compare in screen quality to my One (which is great) and as I'm reading a lot, it will be great for me.
I bought the One as an upgrade to my S3, because I like new phones, I really like the design and the specs, but finally, as I'm always putting a cover on my phones, I will care less and that's why I am OK with the plastic Note 3.
Still waiting for the release...
Current: Samsung Galaxy Note 3 Black
Samsung Galaxy S3
Samsung Galaxy Note
Samsung Galaxy S2