I think her tits were better, but there was at least one guy (considerably older than her) whose cuckolding of me climaxed with him taking my ex from behind, flat on the bed. So he must have thought her ass was worth a boner.
Lovely! Please tell your wife that I would love to kneel behind her and ass-worship her with my lips and tongue. I would part her bum cheeks and run the tip of my tongue around her asshole. Would she like that?