I've compiled some pros and cons for ht and fs. Your additions and comments on them would be great in helping out a fellow biker.
HT pros - 1)lighter, 2) little or no maintenance, 3) pedals efficiently, 4) cheaper
HT cons - 1) harsher ride, 2) just not as fun as an fs descending, 3) no/less bling factor.
FS pros - 1) faster, easier and more fun descending, 2) with stable platform shocks, may pedal efficiently also, 3) bling bling.
FS cons - 1) price price price, 2) more moving parts=more maintenance= more chances of mechanical failure.