I have an eblade and a timmy (which I used for the first time today), and although I like my eblade, I was blown away by the performance of the timmy. They are easier to shoot fast and personally I like the feel more. The biggest difference between the two guns will be the feel in your hands, so I would suggest just getting to hold them both at the very least. If you can't get a hold of a karnivor, just try any eblade...it won't feel that much different from the karnivor.
Both guns have wonderful eye systems, both are fast, and both will serve you well. If you cannot get a hold of the guns, I think your best bet will be to decide which looks the best to you and then see which will be the easiest to get work done on if you ever do have any problems.
Gups said that if you decide on the cocker...you should buy from one of the manufacturers in your country. I totally agree with this, both from the standpoint of convenience and from my opinion that Eclipse (and therefore besales) makes absolute top of the line products. There is nothing better. WGP makes good products no doubt, but when I'm buying a new part for my autococker, I do whatever I can to get the Eclipse part.
If I were in your shoes, my first choice would probably be with the alias, but an eclipse eblade would be a close second.