Which is the best noise gate out of the three?

MXR Smart Gate
Boss NS-2
EHX Hum Debugger

Im looking for one that doesnt suck tone or sustain... and dont say ISP Decimator.. because i cant find one here
Sigs are too hard to think up
i know the NS-2 colours the tone a bit, and it's probably not TB either so i guess you can scratch that...
don't know bout the rest.
Quote by the_crimison
dont say ISP Decimator.. because i cant find one here

Where are you? Maybe we can help.
Ibanez S520EX with Seymour Duncan Blackouts
ESP EC401FM with EMG81/60
VHT Deliverance 60
Laney VH100R
Marshall JCM900 1960B
Maxon OD808
i don't usually use any effects or pedals, so please excuse my ignorance, but what exactly is a noise gate and what does it do?
My gear:
Fender 50th anniv American Strat Deluxe NICE
Fender Eric johnson Strat SEXY
Gibson SG Special Gothic II RAW
Ibanez JS 1000 VERSATILE
Gibson Les Paul Custom OOH BABY
Mesa Boogie Dual Rectifier Head & Cab LET'S ROCK
im in melbourne, Australia, and i know where the nearest ISP dealer is, and it is out in the country, about an hours drive away from where i am.. the problem is is that i go to boarding school, so getting there'll be tough.

and a noise gate just eliminates that annoying hum when you have too many effects on at once or high gain
Sigs are too hard to think up