There should be no selfish thoughts like this when it comes to beacons. If you cheap out and a mate dies you always have that hundred dollars or so on your conscience. Likewise you would hope your mate buys a 3 antenae beacon so he can help find you quickly in a burial.
No selfish thoughts in my post. I agree that one should get the best beacon that one can afford, in order to be able to assist one's riding buddies.
But that was not the OPs question - she was asking whether getting a higher end unit would increase her husband's safety. The answer to that is generally no.