I simply could not pick a favourite . I agree to an extent about Barrie and Glenda, I suppose in the context of the other couples and the way the ladies trained their men to be obedient and totally under control , Barrie and Glenda's relationship offered a contrast to that traditional view and initially represented " the new way". However, Roy Clarke never took it far enough away from the old " Husband works as the breadwinner Wife doesn't work and looks after the family home " which is as you say Maggie dates it terribly when you look at modern life .
I suppose when Ivy, Nora , Edie and Pearl took every opportunity to sow the seeds of doubt in Glenda's mind that what Barrie did or what Glenda allowed him to do would only lead to him being involved with another woman would make Glenda insecure . I suppose Roy Clarke was effectively trying to show that the older ladies were saying it is their way or no way in the context of marriage and they railed against the change that Glenda and Barrie represented.