Stick with the ghostie if you like it - yes.
It will work for you in pve and pvp! And all points in between! (I'm not joking, it's a fine pet).
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and i was looking for a general answer.
And a "general answer" is useful in what way?
I don't mean to be rude, but literally what good is a general answer.
Let me give examples: "What in general is the best kind of car for me to drive?"
"An economy car with good mileage and reasonable safety ratings."
But I have two Great Danes and six kids! See where I'm going? Sure, that's an extreme example. But again, what good is a general answer? Yeah, it sort of puts you in the right direction with the risk of drastically misleading you, right?
Way wayp wiy saah tal! Chant it 500 times, morning, noon and night, and you will see the error of your ways!
(I'll cut you some slack - pets are cool - but it's you you play your hunter that really matters - the pet is secondary to that at best)