Here are some links to both the Brush Hog and Woods medium duty cutters.
http://www.bushhog.com/agtoc.html
http://www.woodsequipment.com/agricultural/rotary_cutters/single_spindle/60-84_med-duty.asp
In every category the Woods 720 is equal or superior to the BH286, except for minimum cut. BH is 1 1/2" and the W is 2". If you download the BH pdf, you can compare the weights. BH is 962# and the Woods is 1140#. The BH needs an 1 & 11/16 socket and 450 ft/lb of torque to change a blade and with wear, most maintenance shops don't even attempt to unbolt them. They just use a torch and cut them off. The woods uses a clip to hold in the blade pin and a 1/2 ratchet with (I think) a 5/8 socket is all you need.
Both these cutters (and the JD equivalents) will probably outlast the country farmer owners, so you really can't go "wrong" with any of them. My OPINION (based on physical inspection of all 3 and long talks with people that supply maintenance parts for all 3) is that the Woods Brush Bull is the overall best value, for ME. Needing the least maintenance and easiest to do what needs to be done.
Your evaluation and OPINION might differ, that's why there is more than one choice... Buy the one YOU like and smile while using it, knowing it is the best machine for you and your uses.
On blades. The "high lift" blades are for cutting thick weeds, grass and small trees / bushes. The cuttings will be ejected more forcefully and clear the cutting deck, keeping the tractor from bogging down. The double sided blades are flat and as it sounds, can be flipped over giving 2x the usage. They are for cutting thick brush and trees at the max of the ratings.
Ever see the blades for the "Big A-s cutters" they use to clear the trees from the right of ways? They are 4" thick x 8" wide hardened steel and have no sharp edge. Just a rectangular profile. The "dull" edge shatters the trees, leading to them dying and keeping the right of way clear.
jb