Bro it’s doom without a shadow of a doubt. I’ve just fully explored act 8, there’s no content that I don’t take my maxed out doom into, he’s the jack of all trades, there’s very very few instances where he isn’t useful, also makes a decent BG defender
Iron man is already a 7* and while his kit is great. There is nothing there that would require you to ascend him and not feel like a waste if you got him as a 7* the next day.
Doom on the other hand has great utility also but the chances of you getting as a 7* in the next 6-8 month is looking slim. Because he isn’t a 7* and even if he was introduced within the next 6 months. He would either be through titan or a special crystal like omega or gifting so if you missed a opportunity to get him during those time you would need to wait even longer. So for least regret doom.
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Doom on the other hand has great utility also but the chances of you getting as a 7* in the next 6-8 month is looking slim. Because he isn’t a 7* and even if he was introduced within the next 6 months. He would either be through titan or a special crystal like omega or gifting so if you missed a opportunity to get him during those time you would need to wait even longer. So for least regret doom.