I would get the accent as the diesel engine is superior for going around mountainous areas and is very efficient
the more expensive maintenance of the accent will be more than cancelled out by the fc

unless you need the style or the trunk, get the accent
but the elantra has a manual mode in its 6 speed (might be useful going downhill) not to sure about the automatic 4 speed accent (probably it has gear locking, not recommended to be used often)