McMurdo's numbers on accuracy are bogus. All GPS PLBs have the same accuracy as it is not dependent upon the GPS, but rather on the limitations of the digital coding.

The Max G does not have true one-hand deployment, the SARLink does.

The SARLink actually has a 35 hour battery. Quite frankly, extended operating times don't matter much since you should be staying put in any land based scenario.

The SARLink has a better, latest generation 66 channel GPS chip which is more likely to get a location in difficult circumstances.

The MaxG has no dedicated GPS self test, the SARLInk has a full GPS self test.

The SARLink puts out minimum 6.3 watts ERP, the MaxG the standard 5 watts.

SARLink has a flashing LED, which could be useful.

Finally, I have greater confidence in the robustness of the ACR product than the McMurdo.