It's not safer to take part in the ICO vs. just leaving the NXT in your wallet. It just gives you a bit more IGNIS.
Taking part in the current ICO means you're selling your NXT. And not taking part means you'll keep your NXT but get 0.5 IGNIS once it's launched (should be very soon after the ICO).
What will give more returns? Nobody can guarantee... it all depends on how well the launch goes, and if there is demand for Ignis and if NXT might get dumped.
You can read all infos about the
ICO process on the Jelurida page, they also have stuff on the roadmaps.
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Thanks!