SPEAKER CABLE OR INTERCONNECT

I think this can be system dependent. Hopefully you can try both out first or return the one that did not perform the best over the other. That being said. Treat your room first. Way more important than those two cables. If you have done that then I am going to suggest power cables too. They say upgrade your sources first. That being said I am a huge proponent of getting your foundation covered first. Room, speakers, amp, preamp and cables for them. Once you have your foundation correct everything can sound good, just different. Like better sound stage, better detail, and last but not least tighter bass. This will help your speakers disappear more easily. I know so many people who gamble with the gear and are not always happy. I will bet you do not have your foundation and room treatments correct. First reflections, front wall between the speakers, and dial in your speaker placement. You will be amazed. If you can have something less attractive try moving blankets from Harbor Freight of drapes from Amazon. I hope this helps. 

I typically follow the old Transparent Audio advice, unless buying used, then it's whatever comes up first...Transparents' preferred order to upgrade was IC from source to pre first, then speaker cables, and lastly IC from amp to pre...

Everybody here who are trying to help thank you.

The cables I currently use are not bad but I am looking for more depth and they are here feeling and more air like phantom images in front of you.

Do no waste money as i some time did - Try for free trial Ice age audio OFC series

speaker cables and interconect before buying expensive stuff.

You will be surprised like i was.

How would one define the difference in sound of  SLC million and HCS speaker cable.