The only differentiation used to be the attack speed, which is no longer an issue. Just to give an example I tamed "The Rake" at level 12. I built him up to level 60, and before the patch he still have the 1.2 attack speed, however, I tamed another cat later on to see if there was any difference in stats or damage. I also tamed this other cat to get some of the abilities, prowl, claw, etc. The only difference was the "Displayed Damage" however the DPS was exactly the same. My pet was faster which made it easier to interrupt casters, but the damage output was the same as a normal cat, the HP, armor, etc. everything was the same, nothing had changed.
Ever since the patch, every pet in its' own respective family are the same, the only difference now are skin colors =P
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According to my guildies, a level 50 cat will have more AP, AC, and HP than a level 15 cat that has been leveled to 50. So I'm wondering if they're wrong, or if the sticky is outdated. Does anyone have any evidence to prove either point?
Screen shot or it never happened. If they have screen shots of a Cat that they leveled from lvl 15 to 50, and a cat that they recently tamed at lvl 50 to compare stats then I would believe them. But I gaurantee that the stats (with nothing invested via points) will be exactly the same, since I have personally seen it and tested this myself (although I have no screen shots =P ).
If anything a Cat you leveled from 15 to 50 would have more Armor and HP if you invested into those stats using their talent points. Now if you respec'd him, and the one you just tamed, then yea they'll have the same stats.