Spousal Soc Sec

[JM117]

will Soc Sec use the larger number between a spousal benefit as opposed to what might be available to my wife on her own account?

[Destiny_Y_JD]

If you are eligible for both a spousal benefit and your own retirement or disability benefit, you cannot collect the combined total. If your benefit is higher, you'll receive only that amount. If the spousal benefit is bigger, Social Security will pay you a combination of the benefits, drawing on both your Social Security account and your mate's, but equal to that higher amount.
Page 7 of https://www.ssa.gov/pubs/EN-05-10035.pdf gives some good examples. 

[Opus 17]

The spouse benefit is 50% of the spouse's retirement benefit.  So when a spouse applies for retirement benefits, they will be paid 50% of their spouse's benefit, or their own benefit, whichever is larger, but not both.