Blaster because it's easier to aim.
Mr Zurkon or Groovitron glove
Mr.Zurkon because the little guys hilarious
constructo pistol or constructo bomb glove
constructo bomb is so powerful!
blitz gun or mine launcher
blitz gun barely
ryno or zodiac
Definitely the RYNO. Zodiac was pretty much pointless in my books.
Tornado Launcher v.s. Dynamo of Doom
tornado launcher cause its cool
n60 storm or the blade gun
Blade Gun because it's very powerful.
Magma Cannon vs. Miniturret Launcher
miniturrest because it's awesome!
liquid nitrogen gun vs wrench
Liquid Nitrogen Gun because you can freeze the enemy before he even touches you! 
Ultrashield Glove vs. Omnishield Launcher
(Note that they both shoot enemies.)
whichever one was made by Gadgetron, I can't remember. 
tie a rang or bee mine glove
Bee Mine Glove because the bees could shred the Tie-a-Rang into pieces.(also,the Ultrashield was made by Gadgetron)
Plasma Striker vs. Sniper Mine
I'll go with the Plasma Striker because…Well, since I haven't played Size Matters, I cannot say anything about the Sniper Mine. 
Plasma Striker was useful, but close targeting was kind of tricky on moving enemies.
Cryomine Glove v.s. Groovitron Glove
Groovatron Glove cause I love to see everybody dance foe or no foe 
Sonic Eruptor V.S Negotiator
Anything that burps out a mating call has my vote for best weapon. So therefore, Sonic Eurptor wins over the Negotiator. 
Shock Ravager v.s. Scorpion Flail
Shock Ravager because I never had the copy of deadlock so I wouldn't know what the other weapon is like at the moment
Drone Device V.S. Miniturret Glove