I've made a simple website that compares the properties of climbing ropes https://ropeparison.azurewebsites.net. Nothing useful like price or available lengths, just information from the UIAA tests. E.g. diameter, impact force, static/dynamic elongation. Inspired by the very useful https://cam-parison.com but much less useful.
It's open source so if you want to go and make it better you can https://github.com/ropeparison/rope-parison
If you notice any bugs feel free to let me know here or raise an issue on github.
Sample graph attached showing that diameter and dynamic elongation as a twin rope are not very correlated.