Balanced or RCA?


For 1.5 metre cable between ARC LS-25 and Bryston 7B STs would it be better to get a balanced cable or use a plain RCA cable? I am no believer in magic cables, so what I am now looking at getting is a pair of Kimber Hero balanced 1.5 metre.
pbb
In lieu of some responses, I would like to elaborate further on what I had stated; some manufacturers design their gear in manner whereby it will benefit one over the other, although they offer both RCA and XLR; therefore it isn't that the cable (type) is better but rather it is a better match for the design.

One person above mentioned Meridian, due to their design, they will tell you that XLR should give you best results with their gear.
Cheapskate that I am, I went to the local musical instrument emporium and bought two Digiflex cables with Neutrik connectors. I am tempted to say that the sound is better using these inexpensive cables with the balanced connections on the LS 25 and Bryston 7B STs than the Blue Heavens with the RCAs. Go figure. This set me back a whopping $41.29 CAD, all taxes included, with no waiting time! "It will have to do, until something better comes along", with apologies to that great lyricist.
Score! (I've heard that expression used in hockey games.) Good for you - count one for our north-of-the-border audio skeptic. More money left over for poutine, eh?... ;^)