is just our experience, but am personal finding hedge knights is gonna be a better option for dealing damage, but hellknights tank exceeding well and do reliable damage. we like to have both hell knights and hedge knights. hedge knights is guaranteed to replenish weekly and with stables in most outposts you will develop overwhelming numbers kinda quick.
a large stack o' clerics provides considerable heals and they are also a durable unit, though am suspecting if you only have a handful they is gonna wilt quick. based on recollection, the cleric heals is powerxd6xunit number, which means you need serious numbers to see results. if your general is healing archers, then he/she ain't doing damage, and even then, is possible you got multiple units requiring heals. cleric heals also do not reduce general energy, but you need a goodly stack to make an impact.
clerics is hardly necessary. have skipped clerics as often as not. 'course have also skipped hellknights, but they got resistance to mind effects and their chaos smite ability means they hit many critters with damage resistance. if you feel you got an either/or proposition with clerics and hellknights, then am thinking hellknights is not a wrong choice. is a few obvious bad choices, but more hellknights is not one such.
@InsaneCommander
am not certain, but am thinking greybor's upgrade (hedge knights?) doesn't happen in his absence. am knowing we got mounted scouts kinda late in act iii for a couple o' our past characters. nevertheless, we got the footmen and archer upgrades early, and those made a big difference in our overall effectiveness. delay all decrees 'til you finished the dragon hunt were likely unnecessary and maybe kneecapped your own army a smidge as well as putting on hold a whole bunch o' decrees which woulda' boosted your crusade.
no biggie. if you killed the dragon, then just move forward and try to get as much done as possible... and don't forget monuments... add as many monuments as possible once that option becomes available. crusade morale and combat morale stack, so add every combat morale option via decrees and whatnot 'cause high morale is gonna mean 2x actions for a unit.
HA! Good Fun!