You just discovered why COC Return is often not the best metric to compare deals, markets, or properties to each other.
I get calls all the time from investors who are targeting a certain cash-on-cash return, and have to explain to them that COC depends on the down payment and debt service, and just because you put very little money down (it it were possible) does not make a property a great deal or a sound investment, even though the COC might be through the roof on paper.
Cash-on Cash is only valuable for an A to B comparison if the terms of the debt service are held constant (so why not just use cap rate in the first place?).
To be clear: COC can be a useful metric, and can be fund to brag about at parties. But it doesn't always tell you whether or not something is a good deal.
If you buy an asset with $10 down and it cash flows $100/yr, that's a super exciting 1000% COC return! But a property that only cash flows $8.33 per month is likely to bankrupt you!