You are correct that 802.11ax is 2.4GHz as well, however, that band is usually known for being overcrowded and noisy, and has to deal with tons of interference from non-wifi sources (microwaves etc.). So if you CAN avoid it, its usually best to do so. Of course, if the 2.4GHz environment at the location is clean, then its perfectly fine to use it of course.
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