If I have been a good enough boy this year, Santa just might have a Manix for me under the tree.
The Manix handle is a little wider than the Military one, which I like. Both blades are about the same length (Military is a tad logner, i think) but the Manix has a thicker, stronger blade. I have fallen out of love with liner locks, and the Manix with the 200 lbs per inch of blade length lock strength is mighty attractive!!
Overall the Manix and Chinook will be larger blades to pack around (heavier and wider) than a Military. If light and lots of cutting power is what you want, go Military. otherwise, my vote is Manix.
Just to let you know, I don't find folders of the Manix/Chinook variety to be heavy (some would say they are folding bricks!) I carry a Buck/Strider tanto right now, and it weighed over 7 ounces on my scale! When I do get to carry my own Manix, I'll actually be downsizing!