Their being WWE or TNA? Actually, doesn't matter because I'm not arguing 'for' the use of any of them.
I just see it like this: when WWE gets a celebrity, it's usually someone moderately well-known and they're often relegated to auxiliary roles. When TNA gets a celebrity, they're usually B- or C-list, at best. They get involved in short-term angles (for the media highlights) that then have no resolution. If TNA involved their celebrities more in a WWE way, I wouldn't have as much of a problem.
Just going by most recent (both happen to be Jersey Shore)...WWE has Snooki as 'guest star' of Raw. She gets provoked, fights back, and is eventually challenged to be part of a match. TNA has J-Woww appear to confront Cookie
(still makes no sense to me. Should've been Snooki & Cookie). They have an altercation. Several weeks later, Angelina from Jersey Shore arrives with Cookie to challenge Beautiful People and J-Woww. J-Woww hasn't appeared since, and no match is on the horizon.
(Again, why wouldn't Angelina and J-Woww just argue on Jersey Shore? It just lacks common sense. I don't watch, but assume both are still on the show.)
I know you're not arguing for any use of celebrities; I just wanted to say my piece on them in wrestling.
---
Side note...I'm starting to get excited about Raw on the 28th. Nowadays I don't get excited until I'm actually at the arena, but I have to assume Rock will be at the show before WM. I secretly hope for a Rock & Cena face-to-face similar to Rock-Hogan because they'll be in the same arena; though this would be interrupted by Miz to preserve the big Rock/Cena confrontation for WM. Wishful thinking, I'm sure. Advertised dark match is: Cena, Orton, HHH, and Edge vs. Miz, Del Rio, Punk, and Wade Barrett...so that should be cool.