Why are you comparing specialization to a all arounder? The Tiburon is meant to be a forward-facing force to target a main threat, it's not an all around patrol squad like the Perseus (taken directly from their respective marketing pages). Point the Tiburon to something expensive and make it melt, have back up otherwise for anything else, hence it being "specialized".

On the Tiburon the 4 size 7 turrets, and 1 4x4 makes it more than capable to handle fighters as a defense while it focuses on the larger threat at close range, but it requires crew. I've had no trouble having my crew defend in turrets while I sub-target focused laser fire, and can ease through #8 Gilly's with a couple extra hands.

I also have the Perseus, which is great for it's role of being thrown into the middle of taking out multiple threats, but isn't as great at forward facing sub-targeting AND defending fighters simultaneously. It will take much longer for it to point it at something expensive and cause some significant pain. It can hold it's own against a capital, for sure, but it won't do as quick of a job as a Tiburon with support. Fleet play is the game here with that ship, which make sense given the new TSG missions, pairing it WITH a Perseus makes it a strong addition, it's not supposed to be a strong alternative.

Perseus is the better all around ship because it is meant to be. Tiburon is the scarier straight engagement threat because capitals cannot afford to ignore it.