Thank you for this one.  
I'm in a similar situation and there's precious little written about whether to take the CV of the pension or take a monthly cheque.  My wife and I are both Ontario civil servants with DB pensions.  We retire 2 years apart & we're both with the same ministry.

One thing to consider is this: changes can be made to the pension plan even after you retire that can lessen your entitlement (look at New Brunswick).  If you take the CV that obviously cannot happen to you.

Also, if you take the CV; the entire amount can be transferred to a spouse upon your death.  With a DB the spouse would be entitled to a highly reduced benefit.

Taking the CV may immediately end his other benefits as well (dental, glasses etc).