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Flash Bangs are the easiest grenade to learn to use.
to actually use though...i'd still say rads. they're incredibly easy to tag other players with. just swing your remote, and lock-on/quickly turn around while someone is near... and its pretty much a guarantee you'll get them. their reach is a bit much.....
flashers are fun, but really not reliable. i use them mainly to escape when i really need to, but like it was said, not reliable. you could directly hit a person, and they may not even get blinded. plus, they can actually easily affect you too, so you really don't want to be anywhere near the one you throw.