Quoted from arcadenerd925:EC:
Green armor, has nice looking wood apron, comes with invisiglass (basically, premium glass that doesnt reflect as much light) + shaker motor
RR:
Red armor, "toto" toy, decals on some targets I believe, some would say a nicer topper (personally I like the EC's better). Does not come with invisiglass or shaker, however, many add them on when buying so check if buying used. Regular metal apron.
You really can't go wrong with either. Just do your due diligence if you go for the used EC to really check it out.
The Ruby red comes with invisiglass and a shaker.