From the two planes you mentioned the Aeroworks 29% is head and sholders above the World Models Extra in flight performance. In fact, in this size The Aeroworks is what everything else is compaired to. The World models however will be in the air flying at several hundred less than the Aeroworks.

I too have read here that Wayne Geffon who is an excellent pilot who has flown both the 27% CA and the 29% AW has stated that the 27% CA (A Lot cheeper than the AW) flies as good as the Aeoworks. That is a pretty strong recomendation because the concensus seems to be that if you have the money and time to build there is none better than the 29% AW.