It was hard for me to choose an pet for my Cata. so I bought two and just compared on even levels. Some I missed, but I think the overall picture is clear to you. Choose what features you need more.
Yes, no any improvement for the money. Clear stats. And yea, its Korean version ToS.
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i see normally 110k pet on cata 
i am not sure what is the reason behind.
do we get a free companion when job change?
yes, atleast we did in iCBT2, dont know if that changed
yea, you still got 110k free pet
do the pets help you tank?
if you mean while mounted, yes, you get some extra hp and evasion while mounted
are the pets/ mount extremely rare?
You can buy Hoglan, Velheider, Hawk from NPC at Klaipeda.
For Piggy, Lesser Panda, and Guinea Pig, they are only available for those who join a guild.
Just wondering, can pets be kept even after you withdraw from the guild?
I know its not even in the same line of artwork, but how cool would a mount be like this:
and
Im sure they plan to add more later.