Sorry, but I dont get it 
You cant compare those! HDR=High Dynamic Range (which is just a term for something), PBR=Physical Based Rendering (another term for something) GI=Global Illumination (aaaand another term for something Enlighten=A middleware for GI
How can you compare HDR to PBR? Thats not working at all since HDR rendering is part of PBR for example. I dont want to sound rude, but I think you should first read again on what these terms mean etc and then rephrase a proper question