haha - red is a girls colour...nice!?
I have been told by many big names - "real pro's use red", I have found for a few reasons.
Most gaffs don't come in both red and blue - actually, Josh Jay makes his overlap gimmick in just red (at least, when it first came out, not sure if he changed that)
Daryl uses red only - when I asked him why - he said because writing is more visible on the back
In psychological studies - red and blue have different effects:
Reds are also viewed as active and exciting, while the blues and greens are viewed as soothing and passive. Physiological tests have revealed similar responses. It's claimed that red hues increase bodily tension and stimulate the autonomic nervous system, while "cool" hues release tension.
Black is considered one of a kind, as it can be either evil and malevolent, yet it also stands for elitism and style. White is associated with purity whereas gray is viewed as dull or boring - perhaps makes you think twice about using a black deck?
Another interesting thing: colour therapy has different colour chakras - and it turns out blue falls by the neck - but red falls just below the waist...interesting that much card magic is done at this level...and the red deck may fall on your chakra if you are doing table magic (why did that sound so dirty) - yet blue would be great for eye level stuff?
Are you starting to see that this response is accurate, yet as ridiculous as saying the red deck is too "girly"? That is real inside box thinking.
Anyhow - I think the best reason for using a red deck is being able to write on the back for various effects - if you don't do effects like that - then it comes down to choice....at least you aer choosing a familiar deck to your audiences - and not a novelty deck sold on a magic web site...sorry T11~!