LSD2 on its own isn't hard to kill but it has a shit ton of defs available altho u can generally force alot of them fairly easily. You literally can't unbound so much, you dont know, u can't unbound Ring, Para stun, paralysis, some of the DK stuns i think etc. + banish is shit
altho i used to play mainly WLS a while back, that was quite literally ages ago, i havent played WLS in ages, last time i remember was to snipe you as a troll and that was literally months ago
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on topic, what the fuck do you mean "the best" there isn't a single best spec or class for arenas, well class wise maybe druid or shaman but there isn't a supreme spec