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I do both a lot
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Both have a support class, Defender and Nightstalker. Both have a Solar PvP class, Sunbreaker and Gunslinger. Difference is Striker is a bit more PvE than Blade Dancer, but Blade Dancer can also support if done right because Invis...but Invis is kinda broken. Striker has shoulder charge for PvP...if you can pull it off. Again, it's really just PvP versus PvE.
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Bladedancer is my main for pvp but I also use sticker on my Titan. In pve I'll use defender/sunbreaker or nights talker depending on what I'm doing