There are actually a lot of differences. There is screen sizes, pixel densities on them, prices, carriers and functionalities among a whole lot more.
As far as the OS updates...they are All running the latest Android version (Jellybean).
But see we have an abundance of choices and liberty to do with our devices whatever we want. Apple nor Google hold our hands and tell us what we can and can't do.
THOUGH STEVE JOBS DIED, IT SEEMS HE HOLDS THE SOULS OF APPLE iSHEEP HOSTAGE, STILL RAPING THEM IN SUCH A WAY THAT THEY LIKE IT.+Leslie Johnson
How come everyone doesn't get their 32GB iPad for $250? Since its way over overpriced at $600?
Its seems like you still overpaid 250$ for a processor, if you already had one to sell in order to get a new one.