It'd be a bit of a gamble, but I'd make it. A devil fruit has a high likelihood of giving me an interesting and fun power to work with that would catch people off guard. Haki is great and useful, but it's far less malleable to the situation and fairly set in what it can and can do. Of course, if I knew I was getting a useless devil fruit or something I wouldn't want (such as most zoan fruits), I'd go for haki.
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