We don't think there's such a thing as a "best weapon" for mage of Martial Empires. If you are looking for a straightforward: "This is the best weapon" answer, you will not find it. If at that time everyone will use this weapon, or make things simple, game developers just want a class of weapons, and do with it. All the weapons have their little pro's and cons, all we can say is use the one you like using the most.
Like we implied in our second sentence if your asking this question because your curious about how things roll for other weapons. We will break it down for you from our perspective of a wheel mage. We are level(martial empires gold) 20 at the moment and unlike the Sword and Scythe builds, we have yet to bump into any "IM CHARGIN MAI LAZOR" skills. Not that this matters it's just that's the way we think of a skill when it has a cast time.
But to be exact, we are referring to the Scythe and Sword skills Tidal wave, and hacking blow. We are sure you know as well as how much damage Tidal Wave can dish out, and the animation for Hacking.
Getting back on topic in terms of DPS here is how we see it.
Wheel Mage : Automatic Rifle.
Sword Mage : Semi Automatic.
Scythe Mage : Good old Pump action Shotgun.