No way the ZDZ outperforms the DA50 guy. Good 3D planes for it,,, Chip Hydes Double Vision, the 87" Extreme flight YAK, Wildhare Edge or Extra would be my choices. The DV is my favorite though.
Well i'am sure you have both engines on 2 identical planes with a ZDZ and a DA to prove that. As the matter of the fact i do , and yes the ZDZ does out perform the DA [X(]. Not by much on power but on throttle respoinse the ZDZ is like a top fuel dragster. If any one has a ZDZ 50ng that is perfect as my DA i will swap you any day!! It doesnt have to have a top name brand on it to perform!
Secound none those planes you mentioned are kits they are ARF's.
The CA 27% extra is a very nice kit. Comes out very light less than 15lbs with a light 50cc engine. I have built one carden kit , they are great kits designed to stand the test of time , but a little on the heavy side. The newer kits may be lighter.
Not a whole lot of 50cc kits out there right now , most folks have just went too ARF's you get nice planes and a lot less time to get them in the air.
But i understand the wanting to build , just gives you a feeling of acomplishment. I hope you find a good kit. The CA gets my vote
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Chad