Thanix Weaponry:
Following the
Battle of the Citadel, human and turian volunteers conducted a massive three-month recovery effort to clear the station's orbit of debris. Secretly, the turian Office of Technological Reconnaissance "volunteers" were technology recovery specialists salvaging the main weapon of the geth flagship Sovereign, and large amounts of its valuable element zero core.
Contrary to popular belief, Sovereign's main gun was not a directed-energy weapon. Rather, its massive element zero core powered an electromagnetic field suspending a liquid iron-uranium-tungsten alloy that shaped into armor-piercing projectiles when fired. The jet of molten metal, accelerated to a fraction of the speed of light, destroys targets by impact force and irresistible heat.
Only 11 months after the battle, the turians produced the Thanix, their own miniaturized version of Sovereign's gun. The Thanix can fire reliably every five seconds, rivaling a cruiser's firepower but mountable on a fighter or frigate.
Turbolasers:
The turbolaser was a heavy laser cannon equipped with large banks of capacitors, allowing them to build up and store far more powerful energy bursts than standard cannons. These capacitors gave huge energy bursts to the beam, greatly increasing its power over standard laser cannons. They also helped power the
galven coils in the barrels of turbolasers. First, a particle beam was generated in the manner standard of blasters and laser cannons. Then even more power was achieved by guiding this laser cannon particle-beam through another stream of energized
Tibanna Gas(besides the one used in generating the initial beam, since laser cannons work on the same principle as blasters) to increase its power. The extra capacitors in a turbolaser that store huge amounts of raw energy then contributed to the beam by energizing it even further as it moved to the turbolaser's barrel. The resulting beam carried roughly three or more times the energy of a standard laser cannon beam.
It then passed through a set of galven coils located in the turbolaser's barrel, even further increasing the beam's power, and allowing it to pierce the defenses of heavily protected targets. Because these weapons required extra time to build up energy for their powerful blasts, they tended to have a slightly slower rate of fire than their weaker brethren (usually around one to two seconds between volleys, depending on the type of turbolaser and what power setting it was on). The risk of overheating was high due to this massive energy buildup, and many turbolaser models were protected with complex
cryosystems and a powerful
cooling sleeveon the barrel.
The fundamental difference here, is that the Thanix-weaponry is by far, superior due to the fact that it's far, far, more reliable and destructive, by the way they operate alone. And the Thanix gun, can fire every
five seconds. That's ridiculously powerful and effective, especially due to the deadly nature of the weaponry. Now, as for the 'lack of mobility', the Alliance and Reapers both had very advanced FTL drives.
The exact FTL speeds at which starships of the modern galaxy travel are unknown. It is
noted, however, that
Reapers are believed to be capable of traveling nearly 30 light-years (283,821,914,177,424,000 meters) within a 24-hour period, and that this rate is roughly twice what
Citadel starships are capable of traveling. This equates Reaper FTL capabilities to around 10,958 times the speed of light.
In comparison, by
2165, human starships are known to be capable of traveling at least fifty times faster the speed of light (14,989,622,900 meters per second).
(Mass Effect Codex/Wiki)
For infantry weaponry, Mass Effect takes the cake.
In
Mass Effect, to generate ammunition a weapon shav
es a projectile the size of a sand grain from a dense block of metal contained within the weapon's body. The projectile is launched at supersonic velocities by decreasing its mass in a mass effect field. Thousands of these tiny rounds can be produced from a single ammunition block. Ammunition is never a concern because of this, but managing the weapon's internal heat is; if a weapon is fired too rapidly, heat will build up inside of the weapon and it will overheat, forcing the operator to stop firing long enough for the weapon to disperse that heat buildup.
So, basically, this beats lasers by...a longshot.
Mass Effect, wins.