I think that the "Big 3" in tractor 3-point finish mowers, if there is such as thing, is Bush Hog, Woods and Land Pride. It has been over a year since I've done any price comparisons, but at that time the Land Pride was the most expensive of the three.
I believe all three to be very good quality, but I did receive negative comments about Woods along the line of "they used to be the top of the line, but have not improved their designs and the other manufacturers have surpassed them while Woods was left behind relying on their name recognition". For me, local dealer representation for Woods products was very poor, and the only finish mowers that they had in stock were 7 or 8 brand new ones and all were about 4 or 5 years old (and were discounted only slightly).
In any case, remember to compare apples to apples when comparing across brands. For example, Land Pride makes light, medium and heavy duty series (model numbers 15xx, 25xx and 35xx) finish mowers with varying deck thickness, overall weight and gearbox hp ratings (among other things). In the Land Pride line-up, and probably the others as well, you have a choice between the Flat Deck design or the Air Tunnel (high lift) design. Most all manufacturers now offer a choice of side or rear discharge. I wanted a rear-discharge mower but found a good price on a good used medium 60" Land Pride Air Tunnel side discharge mower (AT2560) and have been extremely pleased with it.
If I had to purchase a new one, however, I would probably purchase one of the lesser know name brands such as King Kutter, Caroni, Farm King, Befco etc. I have not heard of any major problems with them (I remember polling this board as part of my research) and they cost in the $800 to $1300 range versus the $1300-$1900 range for the "Big Three".
Hope this helps at least a little,
Kelvin