The major difference between filters and custom fields is the fact that custom fields are SPECIFIC TO EACH user (eg: registration number).
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In addition, these are entered manually for each user, they do not appear in drop-down lists as for filters.
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The custom fields have been created to be put, among other things, in a certificate (for example to show the registration number of my user).
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Filters are a way of sorting users in statistics (eg: department, country, etc.).
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Filters can be common to various users.
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Unlike custom fields, we do not enter them manually. The administrator creates the filters in the administration part and then, when registering each user, the filters are selected from drop-down lists.