People have different tastes. I had a super bright pink cistus growing in my middle garden that was a rescue job gone nuts. It suited the aspect, I enjoyed its habit and foilage very much, it was even serving as winter protection for a less hardy canyon sage but it was just an awful shade of pink flower.
What made things worse was a nearby orange-red rose that was just too orange against hot pink, so it had to go and you know what..the rose died afterwards
So it could have stayed after all.
I really don't mind pink in the garden, just so long as it doen't get too hot.
Now..Clematis...I'm still learning which ones I like best. I really like the sieboldii and the Alpinas are delightful, but I will have to do my research better.
From your choices, I'd partial to Romantika but not so much the Rouge Cardinal