Their are 3 type of FvS to look at. Each one shines in its area.
Evoker: This FvS is the most effective scroll farmer (as far as divines go). If you do not have an arcane to scroll farm, then an evoker makes for a great backup. Their are several epics where reflex saves are not that good, and having a DC35+ bladebarrier will allow you to kill alot faster than melee soul. If however you have an arcane at cap, I would use the arcane for scroll farming. Its just easier, you don't have to kite or move at all for that matter. I actually lesser hearted my melee soul back to an evoker for the time being because I do not have an arcane scroll farmer, and I like seeing 300-600dmg bladebarriers. Let me just echo what Nick said. You will not be instakilling in epics as easy as an arcane, not even close. The tougher epics will require energy drains before destruction or implosion will land.
Melee: This FvS is the most effective in a party situation. Even if you are not a warforged you can use an esos and still have higher attack bonus then using any other weapon you are proficient with. ESoS + Divine Punishment + Archon + Keep everyone healed = a very good addition to any party or raid. In this situation I would not look melee damage alone, because the ESoS alone does not make you the top dpser in a group, but remember dps is not just melee dmg. Look at what the build brings to the table as a whole for dps not just its melee dmg.
Defensive: This build is for those who like to solo epics and or elite raids with minimal to no consumables. H-Elf with fighter dilettante is the way to go. This gets you an additional 20% healing amp and martial weapon proficiency. This build is actually alot of fun, if you like to see what you can do without using scrolls or potions. 650HP + FvS DR + Shield Mastery + Con Opp + Torq + Demonic Shield + Healing Amp + Healing Capstone = Able to withstand just about anything in the game, using only archon and divine punishment to kill stuff. Its a slower ride, but again their is something to be said about soloing Tod with no consumables used. This build will be about 6 points of str behind a pure str focused melee soul and can still melee with an epic sos and not be too far behind in damage.
All three can heal effectively, so really it boils down to what you want to do when you are not main healing.