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A 2017 meta-analysis compiled data from 31 studies to analyze whether HIIT cardio provides a fat loss benefit over moderate-intensity cardio when the number of calories expended is matched [1]. No significant difference in fat loss between the two forms of cardio was found.
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This provides strong evidence for the case that HIIT and moderate-intensity cardio are similarly effective for fat loss, as long as you burn roughly the similar number of calories per session. Personal preference, time availability, and your individual fatigue tolerance should determine which form of cardio you perform.
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If you're short on time, HIIT is a great way to get in a quick cardio session [2]. But if you follow a strenuous resistance training routine, moderate-intensity cardio will be overall less taxing and, therefore, may interfere less with your strength training [3].
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Next to HIIT and moderate-intensity cardio, it's of course also possible to go on long walks. In essence, anything that keeps you moving and makes you expend more energy can help you in your fat loss phase. Not a single form of cardio is inherently better for fat loss than the other.
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References:
1. http://onlinelibrary.wiley.com/doi/10.1111/obr.12536/full
2. https://www.ncbi.nlm.nih.gov/pubmed/24552392
3. https://www.ncbi.nlm.nih.gov/pubmed/9927024