Well, I only have experience with Katana/Dark, which is an excellent combination. Dark actually has one of the best heals in the game, the stealth you mentioned, a stun aura, a fear aura, a tiny little bit of defense. The whole is somehow greater than the sum of its parts, where the combination of stealth and the stun or fear aura break up the alpha, the resistance lets you survive it, and the heal lets you recover from it. The alpha breakup also helps with getting Divine Avalanche up and stacked, since before it's up can be the most dangerous part of a fight. Absolutely top notch (edit: to clarify, top notch survivability) when IO'd to the gills (see sig), but also very good before that point.
But really, I'm pretty sure that Katana makes them all good. One thing they all benefit greatly from is a lot of defense, and that's what Katana provides.
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"Four hours in, and I was no longer making mistakes, no longer detoggling. I was a machine." - Werner
Videos of Other Stupid Scrapper Tricks
I've also only got experience with Kat/Dark, but the basic differences amongst the sets are:
Fire: most damage (Blazing Aura, Burn, Fiery Embrace), good heal, End recovery tool
Elec: good damage from aura, ok heal, best End recovery/discount tools, built in +Recharge
Dark: good damage from aura, strongest (situational) heal, built in Defense, built in Stealth,
2 extra "mitigation auras", can be End heavy*
The one thing they all have in common is a lack of KB protection (except for Elec's Grounded, which is often skipped), so you'd have to dip into IOs or Acro to fix that.
*slightly overrated, can be overcome with good slotting and intelligent play
Also Elec has built in KB protection in grounded so you do not need KB IO's or Acrobatics
Unless you plan on making a flying toon then it all changes and you just skip grounded
Dark Armour is a utility chest set
Pinnacle
Langar Thurs-Katana/SR 50; Hejtmane-DM/DA 50
Rogue Spear-Spines/DA 50; Hypnosis-Ill/Rad 50
Sir Thomas Theroux-DM/SR 50; Melted Copper-Fire/Shield 50
Byzantine Warrior-DB/ELA 50;Blade Tempo-50 DB/EA
I want to make a scrapper, a katana scrapper, and combine it with a damage aura. I'm just curious what the pros and cons of each of those sets are. I know fire has a great heal, dark has a built in stealth, but beyond that, I really don't know much about the sets. Any help would be mucho appreciated.
Thanks.