For the purpose of accumilating perkies, I currently like the Mossie with the hitting power of the 4 - 20mm hispanos and relatively good turning ability. In spite of the slow climb rate, I especially like the Mossie against bombers. Off a carrier, I almost always use the agile FM-2 for the perkies.
My favorite planes overall,however, are the Me 109's and FW 190's. I just like them, period. Their relative performance has almost "niche" qualities when compared to some of the other aircraft that can generally do everything well, but excel at nothing.
Some planes like the pony, the LA-7 and the Nikki and Spit are marvelous aircraft that I love, but don't fly much because it seems like everybody else is flying them, and they don't reward you with very many perkies.
(I'm always scrounging for perkies so I can crash the jet

)