I have 3 or so Crown companions. Eagle archer, scorpius, and shark buccaneer from the citthroat bundle. The first one i bought was the scorpius companion cause only witchdoctor gets him and i had to have him being im a swashbuckler and a scorpio lol. I have both the golden scorpio pet and the scorpius companion because im crazy like that and like scorpions. Next i got the shark buccaneer companion at level 20 when i purchased the cutthroat bundle. I like sharks too and bought the shark mount. Lastly i bought the eagle archer cause i didnt have a whole lot of musketeers on my team. I was dissapponted in that choice however. The eagle archer again is under damage capacitated doing very little damage vs other companions so no real want to play her. I have the ninja pig companion maxed for my level and he is one of my favorites but was free and does great damage.
Ha. More than I should probably admit in public! My first two pirates to hit the 50th-level cap had almost two pages each of companions, which I suspect works out to be 4 or 5 each... not sure off hand. The third one to hit 50 has been more conservative - he runs a tighter crew. All of my five pirates have at least one.
My preference is for the five starting companions and the various Ratbeard and Presido companions. They are the strongest companions that are not universal. (I loved the "My Hearties" sale in Feb!).
And Goronado. How can you not have Goronado on your crew?