Which to choose?

Looking to play a melee class of some sort. I've come down to choosing between Stalker or Scrapper to do so. I will be taking this toon through Praetoria and am not afraid of some initial difficulty with the class as long as the payoff in the end is worth while.

I'm looking to be able to effectively solo mob spawns for x8, at anything between +0 to +2 to be happy. Higher than +2 would definitely be a plus. However the biggest factor is having the aoes along with enough reasonable single target dps and soft capped defenses to be able to solo any EB i come to without problems. AV/Heroes too if possible but not really a necessity. It doesn't have to be an OMGWTFBBQ farming build, but something that doesn't have issues taking down a 10 mob spawn or a hardened target.

Another factor is I like taking stealth and using stealth i/o's to quickly complete missions, or stealth through areas without gaining aggro. Any builds I make will be constructed around this concept. Stalkers gain this innately in Hide, so its a point in that category.

I'm leaning towards electric melee for the aoes.

If scrapper probably ElM/SD.
If stalker probably ElM/Nin.

I have concerns with both builds. Concern that the scrapper lacks in single target damage what the stalker can gain from Assassins shock in an attack chain. Also concern that the stalker loses both st and aoe dps from seemingly lower base attack from the AT differences and lack of AAO that shield provides, while having lower hp. I realize Nin would have the heal, but lower resistances compared to shield and less hp from the AT.

So I guess my question is which would you choose and why?

Also would any other builds meet the criteria above? My friend plays a Claws/SR stalker, and does really well, but honestly the single cone/aoe in the form of knockback with shockwave is completely meh in my opinion. Does the spin power in the scrapper claws primary make up for the loss of burst from AS when fighting hardened targets? His character is the primary reason I'm considering stalker at all.

Generally, at the moment it is better to pick a scrapper over a stalker for performance reasons, except in the case of Electric melee. The extra damage from AS in an attack chain (there's a trick about elec/nin that means you don't have to waste time with placate) make Stalker Electric melee significantly superior in single target damage, while having slightly lower or equal or higher AoE damage than the scrapper based on team size.

Between /sd and /nin, it's kind of a wash for me as I love both sets. I don't generally see shield charge as all that helpful to electric's AoE emphasis unless you're farming. AAo is nice, so are caltrops and blinding powder; an uninterruptible self heal is great, but so is increased hit points and resistance. Either could solo at x8 when softcapped, and pretty easily as long as it's not something like Nemesis that eats through defense sets. I will say that the tier 9 on my shield scrapper is a bit more useful than that of the nin stalker, but the shielder is quite a bit more painful on endurance.

Tl;dr
General effectiveness/taking hard targets: Stalker
Farming/likemesumshieldcharj: Scrapper

You may want to consider Brutes, too. Stalkers are way too squishy. Brutes deal a little less damage than scrappers, but are far more survivable. I've heard /SD brutes are, well, brutal.

Stalkers sacrifice any inherent means of aggro control for the ability to burst damage a target via Assassin's Strike. Given the other ATs get equivalent sustained single target DPS, greater AoE DPS, higher HP, and the ability to pull aggro from your teammates, they're usually my choice.

That said, I'm usually playing a 'game' for the feel of a character, so I usually just pick whatever AT best exemplifies how I imagine my character.