shockers are great guns, closed bolt, easy to maintain, and comes with the best SP has to offer. Great accuracy from the barre, comes with a HE bolt as standard as well. I had the chance to use an etek and then used a freinds ego6 and found that the etek was a good marker, but for £475 wasnt worth the money, an ego may be more, but any1 whos used an ego will tell you theres no other like it. With the shocker you get more marker for your money, i have one and i bought a q lock, but there really isnt need to install it as the stock feedneck is great, the barrel is super acurate and you get about 1200 shots per fill.
I would go with the shocker out of the 2, but if you can, maybe strech to a ego7 or buy a used ego6