Display MoreTRS cables can be used in mono applications. There may be a need to use TRS when a cable run picks up noise. See this page...
https://producerhive.com/buyer…ssories/ts-vs-trs-cables/
"TRS cables have three contact points: tip (T), ring (R), and sleeve (S). That extra contact point makes a big difference because it enables a balanced audio signal. That’s why these are also called “balanced cables” or “balanced TRS”.
The tip has a positive wire, and the ring has a negative wire. When the audio signal passes through, both the wires gather any noise and interference. But since they have opposite polarities, the noise is canceled out. This helps produce a clean, crisp, and pure audio signal.
Unlike TS cables, the TRS cable can be used with both mono signals and stereo signals. So, it can be used with headphones or any equipment that requires balanced connections. It’s also safer to use TRS cables when you need to plug equipment into multiple devices. It can work with mono balanced, unbalanced mono, etc. That can take out most of the guesswork over which connectors to use on the right channel."
This only applies if the equipment at both ends supports “balanced” signals. The Monitor Out is TS (unbalanced) so there is no advantage in using TRS cables in this case.