The casing size is roughly about the same between the phones, but the display size went larger, from 4.8 inches on the S3 to 5 inches on the S4.
Using the Samsung Galaxy S2 (I9100 was the most common variant), the Galaxy S3 is taller, wider, and a touch thicker. The S3 has a significantly larger and higher resolution screen (4.8 inches vs. the 4.3-4.5 inches depending on the variant of S2), quad-core (S3) vs. dual-core (S2), was due a newer version of Android OS (KitKat).
Yes
To root a Galaxy S3, see the related link below.
No, the Galaxy S3 does not have a built in HDMI port.
No, The Galaxy S3 Does not have an HDMI port built in.
S3.
Nope! It's smaller than the S3.
The Samsung Galaxy S3 was released on May 29, 2012.
I would get the Galaxy S3.
Yes, the Samsung Galaxy S3 comes with a pre-installed texting app.
Yes, the Samsung Galaxy Ace is older than the Samsung Galaxy S3 Mini. The Galaxy Ace was released in January 2011, while the Galaxy S3 Mini was launched in October 2012. Thus, the Galaxy Ace predates the S3 Mini by nearly two years.