How do I compare workload (demand) vs capacity (supply) to identify any deficit?

You can do this in multiple ways in Runn.

The Workload vs Capacity Chart gives you a quick visualization to identify any deficit.

This insight is available in the Capacity Dashboard under the Insights function, will isolate the specific deficits by role for you.

This insight is available in the Capacity Dashboard under the Insights function.

If there are many overbookings (red bars), it indicates a deficit.

If you are using the Resourcing Requests, you can also use Insights > Workforce to see all the hiring proposals.

If you wish to identify deficits in a table format or have a long time period, use the Capacity Forecast by Role preset people report.

If the Scheduled Total is greater than the Effective Capacity, that means you don't have enough capacity to do the scheduled work:
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The report enables you to view current hiring needs to support proactive resourcing by role.