[deleted]
Dear Dr. Christian Corda,
Thanks for your good and easy going ( but with deep implications)article on the detection of GWs. I wish all success in your endeavour.
According to me there are 'No' gravitons (you will come to know of it, if you go through my article on Quantum-Gravity in "http://www.sreenath.webs.com".) But there could be GWs like sound-waves but without any medium to traverse or even like light-waves as thought in 17-19 century without carrying light quanta.
Had there been gravitons,they would have asserted their existence by now like photons.As to which theory stands the test,out of the 3 theories you have proposed,for me it is Einstein's GR (what else?).