I am new here and can't comment on whether CD in general makes better partners. I do know since I got completely comfortable with my own sexuality as a Bisexual GG, and let go of all the societal rules that allowed me to be finally comfortable with my partner's CDing, we are better partners to eachother. I have known I was bi-sexual and always felt I had to choose, and be caught by it, and when I finally got to a place where I was comfortable with him CDing, he opened up and I got a girlfriend and a boyfriend all in one, without cheating or a threesome.
As some have said I really wanted him to experience being female beyond the clothes as well, so we have been doing different breathing exercises, and sexually working on surrender. I love David Deida and all his work on spirituality and sexuality, and so allowing ourselves to switch roles, was empowering for both of us.
So long story short, us getting to a place where CDing is open and comfortable has definitely made our relationship better and stronger