Blue Jeans Cable Sound Good???

I have transparent thru out my system.  When I purchased a new receiver I decided to demo an audioquest digital coaxial between bluesound 2i and mrx 720, just to see what it would happen. Ive had this cable for 6 weeks. Without a doubt the difference was dramatic.  I will be putting the transparent back in the system and returning the audioquest. Audioquest is to bright.  Transparent was smooth.  And it's the bottom transparent cable I've had for 20 years.  I do have a question.  Without listening to the cable, is there any way to make a good choice of which cables to purchase, like amp power, receiver and speakers on regards to ohms, speakers etc... not sure if I'm asking the right questions.  Certain gage of  speaker cable. I see many talk about 11 awg and 10 awg. 

Ieales, thanks for the answer.  That's quite a bit of info to factor in and probably not for your newb like me to figure out. What do you mean by xlr without screen lifted at destination end?  I do have rca out to xlr on amp.
Thanks

My amp is a bat vk200. It is a balanced amp. As far as the connection goes, all I know is it is rca to balanced. I need to look at cable, I believe it is analysis plus. Its 20 yrs old.

ieales, I have a question a bit off subject. I installed cat6a shielded thru out my home. I bought a shielded patch panel and when connecting the  cat6a the shield of the cable is fastened to the panel. A ground cable is connected to the panel which drains off any interference in the shield.  Why is that not the same for audio?  I just asking because I'm a bit confused? I realize shielding stops interference, should that be drained of into ground.  I am a newb just trying to understand.  Ty