Stability:-On the whole I think it would be fair to say that W&W have made an issue out of stability (torsional rigidity) and used crossweaved carbon to achieve/enhance this from an early date.
Hoyt have just recently introduced crossweaved carbon cloth to add extra stability to their limbs, how much the extra stability will improve grouping has been discussed/argued on this forum before (try doing a search)
Speed:- can be less imprortance than it is made out to be (do not expect to see a huge difference in limbs from either manufacturer), sometimes extra speed results in an unforgiving bow (fast nines or slow tens), requireing a more exacting input from the archer each shot to get the same results , extra speed from a limb means you can shoot lower poundages should holding weight be an issue.
Feel:- "harder or softer"
draw force curves storing energy earlier/later as the bow is drawn will be a major influence and dictate how a bow feels, some give a bit of resistance at the clicker activation point that some archers like, other archers may prefer an easier draw through the clicker, this can be an option available from the range of limbs each manufacturer has on offer.
Durability:- pot luck.
Try as many limbs as you can, see what you like, what theories make the the most sense to you, then when you don't get the desired results buy some new limbs, as it must surely have been the limbs at fault :bomb: