"In theory" the Dacron filter is "better" because the finer filter media catches more debris.
"All" transmissions create debris just in normal operation.
Ford valve bodies and governors are not very tolerant to fine debris and tend to stick the valves.
That said, the Ford engineers obviously knew what they were doing when they specified a metal mesh filter.
The C6 pump is not particularly high volume,
but is does need the flow capability of a screen filter, rather than the Dacron or other paper type media.
Restricted pump intake is more of a concern for pump damage to occur, not so much for the rest of the trans burning up.
You don't want the pump to work so hard to pull oil from the pan, and potentially "run dry" as damage *will* happen.