Pictured is one of my M3 characters.

Quote - Here's my latest render using both him and PosetteV3.
DPH

Aww... Duke is so cute. ^^
But I am biased.    ;)

Duke (p4male)
Duke has the most free clothing, hair, and textures. He is low res and fast to work with. Great for a newbie to Poser.  I would have LOVED to have Duke back when I first started. The new UVmap is great! ^^

M2
The best Muscles in Poserdom go to M2. If you want a body builder, go to M2. There is no equal when it comes to muscle. ;)

Apollo
Apollo is a must have. He is now free. He poses well and has many marvelious innovations. He is a great morphing character too. He comes with many  quality goodies.

Hiro
Hiro is Daz's unimesh Anime male. He is Daz's best morphing and posing male. I love it! And he has great expressions too. So cute! ^^

David
David is an inbetween figure, an improvement on M3 and precursor to Hiro. David is smaller than M3 but poses better.

G2 Males
Koji is the best Asian male, and he has the most expressive face of the males too! James also has also very realisic face. The trade-off to this is that's harder to get way from their default look (much the same problem with M2). The G2 versions are an improvement in posing, but their meshes tend to look lower res when compaired to the Big Daddy of the males... M3.

M3
M3 is the moviestar of Poserdom and the most widely supported with clothing, textures, hair, and poses. He does have his flaws (shoulders cough). But, imho, M3 has a perfect default shape, I don't need to mess with his body shape. He is my figure of choice because I do mostly closeups, and his excellent uvmaps and high res mesh allow for amazing morphs and characters! See image above. ^^

bB