The main metrics I use are cash flow, COC return and ensuring a property fits my BRRR criteria for purchase price.

Reason being most realtors deal with the average purchaser who is someone looking for their own home so it is easier to please them by finding a property as its simply about price budget and most purchasers already the type of property and location in mind.For a realtor to be useful to an investor, they need to be knowledgeable about vacancy rates, average rental rates, whether 1bd vs 2bd vs townhouse is more profitable a purchase, knowledge across multiple cities for the aforementioned and other know how to calculate metrics that investors may be interested in like cap rates, cash on cash returns. 

Networth and percent equity are better metrics than cashflow or number of doors to gauge success. 

This is why these developers move around the country almost in packs to where the metrics do make sense at any given time. 

I would be hesitant to use CAP rate as a primary investment metric in South Chicago but it's an OK place to start.  

Unlike GRM or other metrics, cashflow is highly dependent on your loan amount and terms, as well as your CAPEX, Repair, and Vacancy assumptions. 

My name and metrics are in the subject heading.

Yes, Compass is the 3rd largest and eXp is the 5th largest by the volume metric.

DSCR and other metrics are way more important.

The metrics are very different though.