Hey,
I went through the last few hundred thread titles and didn't find something like this. The search gives a thread from january 2010, but some ships seemed to have pretty different properties then.
And yes, the default answer is probably: "Try something new, everything can be the right tool at the right time. There is no best ship." But still some ships feel just plain cooler. So please tell, which you prefer to get as your personal starter boat. Here's my list for now (though I'm still lacking a lot of experience, since I just recently started to get into this game).
Raider: Yay! Deep strikes! These little thingies are great for neutering planets. And they totally wipe out frigates. And they are fast. And you get hordes of them.
Autocannon: Speedy and hordes, too. Though they pack a lower punch than raiders as far as I gathered experience with them.
Parasites: You got some funny ships? Cool, I'll get a few of those, too
Though they seem to become less useful in later stages. Maybe I just stopped using them, when my blob reached a size, where a few reclaimed ships don't really change anything.
Honorable mentioning:
Viral Shredder: Ok, these thingies have some mean abilities. And you get more and more and more of them. I haven't chosen them as a starter ship yet, but got a few from a level 5 cache at one time. I had hundreds of them on most key planets, before I switched to a new game. Besides, I liked to pair them up with Parasites, when there were Acid Sprayers or other fusion cutter-immune ships around
The two things that frighten me away are their horrible speed and the large number of fusion cutter-immune foes.