Which is the safer estrogen source for vaginal atrophy and urinary tract problems, estrogen ring or vaginal estrogen cream?

I am 57 and am in menopause. My mother had breast cancer so I was not a candidate for oral estrogen to manage menopause symptoms. I have used Effexor and vaginal estrogen cream to manage symptoms. Recently the hot flashes started subsiding and I went off of the effexor. I still require the vaginal estrogen cream to prevent urinary incontinence/vaginal atrophy. It seems like the estrogen ring would be safer for women with breast cancer risk. My doctor is willing to switch me to the estrogen ring if I can find some information on the safety. What are others experiencing with using vaginal estrogen cream or the estrogen ring?