Arc is right you know. If you follow the Star Wars novels, Boba makes a reappearance in several of them. When they ask how he got out of the Sarlacc's mouth, he merely said that it found him to be "somewhat indigestible" (must've been the armor).
As for my vote (albeit 3 years late), my money is on Samus. She has way more better gear to protect herself than just the armor. She can jump in the air and use the screw attack to make her invisible. She can roll into a ball and dodge all of Jango's attacks, oh and finally she has a freeze ray that can stop Jango Fett cold (no pun intended).
Silent Bob did bring up a good question though. The 'Metroid' choice, did Arc mean Samus, or did he mean the Metroids themselves? If the battle is between Jango and the Metroid itself, then that could be a close battle, since the only way you can destroy a Metroid is to freeze it and then slam it with several missiles. To my knowledge, Jango doesn't have a freeze ray in his arsenal, so he could have a tough time with thise annoying creatures as it is.
Stay tuned to the next exciting episode!