Sunsingers have Fusion Grenades and self-revive. I think they are better in PvP. Defender is more of a PvP support class.
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yeah but every class gets a sticky nade so fusions are nothing special
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Self revive is more beneficial for PVE than PVP. It's nice to revive and get a revenge kill but you can end up coming back and instantly downed again. This just makes things worse since you gave the opposing team more points.