If we're talking about Arena's here, the answer is hands down Poe and will likely continue to be so until more characters get released and perhaps even beyond that
His taunt will protect squishy dps and removes turn meter from the other team giving you a huge early advantage in Arenas...assuming their Poe doesn't taunt first
Fives is pretty good, especially for galactic war. He's decent in arena with a Phasma team. By the time you unlock Poe he'll probably be nerfed lol. There's an update coming in February so i'd wait to see what they do to Poe before you unlock him
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His taunt will protect squishy dps and removes turn meter from the other team giving you a huge early advantage in Arenas...assuming their Poe doesn't taunt first