there is a blog off of theory/tankspot that shows you can get either one. however, imo, if you need the extra 240 armor, 3% crit and ~4% dodge (if wowwiki is to be believed, 25 agi = 1% dodge), i would very much go for mongoose.
i plugged some numbers into maxdps.com (sun eater weapon stats, and obv no impale, dw spec, flurry etc.), and it says that if the tank is buffed with BoK, 100 armor penetration does not exceed the dps from 10 strength til about 2700 AP fully buffed.
Edited, Feb 9th 2008 5:28pm by fromanthebarbarian