So far I have used an iPad 2 at 9.7 inches, a iPad Mini at just under 8 inches and a Sony Xperia Tablet Z at just over 10 inches.
The buying decisions for each were simple at the time. The iPad 2 was at the time the only tablet worth buying. I replaced my iPad with the Mini as it was lighter and easier to carry around due to its size. Also the screen was clearer than my old iPad 2. I considered the new full size iPad but decided against it due to its weight and lack of features versus the Sony Xperia Tablet Z. The Z was lighter, thinner and had some great marketing specs including waterproof, dustproof, IR blaster, ultra thin and lightweight, better screen than the Mini, USB OTG, support for using Sony PS3 Dual Shock controller to play games and more.
However, after exploring these tablets, I am left with some thoughts over the ideal tablet size. If you browse the internet a lot, the Mini is just a fraction too small IMO. You really need and a slightly larger size. But the problem becomes that the larger the screen size the heavier the tablet. And the Mini is the perfect size for weight and portability. So actually what you really need is a retina iPad Mini or the new Nexus 7. Actually, I believe for my needs the Sony Z Ultra smartphone is my perfect tablet. Pocketable, waterproof, brilliant sharp screen and can also be used as a phone. Also android phone apps won’t look as bad on a 6.44 inch screen as some do on the Z Tablet’s 10.1 inch screen. Also note that at present the iPad has the best selection and designed apps.
So which way do you sway?