Depends on the weapons... An obvious answer is "
Why not both?"
Full Auto Pistols in each hand... OR Full Auto Basic weapons with the "compact" upgrade in each hand. With the proper talents it's basically the same as firing full auto except you're doing it twice.
PROS
Twice as many attacks.
Can Load different types of ammo into different guns.
Can shoot two separate targets at once. (with the right talents)
Can fire pistols in melee.
(Looks badass)
CONS
Costs twice as much ammo / guns
requires the taking of multiple talents
Pistols or compact basic weapons tend to have a shorter range than their 2 hand counterparts.
Need attachments to compensate for low clip / range and long reload time.
Basically, I'd use full auto on 2 handed basic gun to start with, and then work toward dual wielding pistols down the line.
I had a Scum who owned 7 pistols with various types of ammo in them and never reloaded in combat, he would quickdraw various pistols and dual wield them... most were fully auto but kept a revolver or two with special ammo in. Also two had Bayonet attachments for when it came to melee. (even though you can fire a pistol in melee). He named his guns after the Seven Deadly Sins.
The other option is obviously shooting single shot in each hand which isn't bad because 2 shots = two chances to hit. Even fully auto you only make 1 attack roll for hitting. You need to get your bonuses from elsewhere though... so maybe using Aim Actions and stuff... two accurate pistols with scopes on single shot with aim actions seems quite deadly. Especially if you use the ONLY WAR updated "Accurate" rule:
Accurate
Some weapons are designed with precision in mind and respond superbly to skilled hands. They grant an additional bonus of +10 to the firer’s Ballistic Skill when used with an Aim Action, in addition to the bonus granted from Aiming.
When firing a single shot from a Basic Weapon with the Accurate Quality benefiting from the Aim Action, the attack deals an extra 1d10 Damage for every two Degrees of Success, to a maximum of two extra 1d10.
Candidates for Full Auto dual wield.
“Fury” Assault Laspistol (Triplex Pattern) - Las Pistol
5 shots on full auto, 30 clip and reliable. Only a 20m range though. Very viable if you increase range.
Extra Grip Minerva-Aegis - Las Basic
8 shots on full auto, 40 clip and reliable. Range is 30m.
Extra Grip D'laku Hellgun - Las Basic
5 shots on full auto, 40 clip. Range is 50m - very expensive.
Autopistol - SP Pistol
6 shots on full auto, 18 clip. Range is 30m
Hax-Orthlack Puritan-14 Execution Pistol - SP Pistol (can also be fired as a shotgun)
6 shots full auto, 14 clip, 20m range - Needs more clip and range... can be fired as a single shot shotgun at a -10 if not held twohanded... brilliant for close combat because it's a pistol and a shotgun in close combat is OP... let alone dual wielding them for friggin TWO shotguns in close combat.
Hecuter 9/5 Heavy Combat Autopistol - SP Pistol
6 shots full auto, 15 clip, Reliable, 30m range - needs moar clip. Reliable is nice though.
Orthlak Mark IV Thollos Autopistol - SP Pistol
6 shots full auto, 12 clip, 30m range, - this is an awesome pistol for 75 thrones... Duplus clips make it 85, and with rapid reload that's 4 turns with a free action reload in the middle. That's 8 full auto bursts of 6 bullets hitting with 1d10+4 each. 170 thrones isn't much to pay for duals of these babies with duplus clips.
Sulymann Encarmine Service Autopistol - SP Pistol
8 bullets - 24 clip, 20m range - needs more range and the damage is a piddly 1d10.
Talon Mark III Short Autopistol - SP Pistol
6 shots full auto, 18 clip, 30m range - Special rule on this one allows a 30 clip for a -10 BS penalty... interesting.
Extra Grip Cadence “Spectre” Assault Device - SP Basic
10 shots full auto, 20 clip x 3, 40m range. - This has a built in fire selecter, allowing 3 20 bullet mags. which does mean they have to be reloaded seperately... also has an inbuilt shotgun.
Extra Grip Hax-Orthlack Creed-9 Autogun
10 shots full auto, 35 clip, 25m range.
Extra Grip Autogun
10 shots full auto, 30 clip, 45m range - Kinda awesome... but for the same price... see below...
Extra Grip Autogun (Armageddon Pattern)
6 shots full auto, 15 clip, 50m range, reliable. - DING DING DING winner... all good stats, it has all the things you want and only costs 125 thrones (including compacted). This thing was designed to have a pistol grip slapped on and dual wielded.Yes, making a gun Extra Gripped costs 25 thrones and halves range but then you can use 2!
I'm going to stop typing now... otherwise your post is going to turn into a handbook or something... sorry
It's just more interesting than work atm
EDIT: I have made an error... It's not compact you want... it's extra grip! I need to edit....
EDIT 2: I have edited... I believe it to be mostly accurate...maybe.