What is the BEST dps(exotic) hunter pet?
I didn't watch. Sporebat I assume?
It's always Sporebat.
To seriously answer the question without being a video, there is no single best pet for any group situation. Bring a buff your group doesn't have.
If you're soloing, you'll see the biggest benefit from a Devilsaur/Quilen/Water Strider (5% crit), Spirit Beast (5 mastery + a self-heal), or a (non-exotic) Serpent/Hyena (10% attack speed). If your group already has all raid buffs covered, then I'd suggest either a Spirit Beast (emergency extra heal) or a Tallstrider (AoE sunder armor -- other classes bring solely single-target sunder armor).
This chart is slightly dated as everything can be speced ferocity and MoP brought some new exotic pets, but basically take a look at this:
Please report any Code of Conduct violations, including:
Threats of violence. We take these seriously and will alert the proper authorities.
Posts containing personal information about other players. This includes physical addresses, e-mail addresses, phone numbers, and inappropriate photos and/or videos.
Harassing or discriminatory language. This will not be tolerated.