The biggest difference is the price and the size. Both EF and WH are absolutely top-quality airplanes, easily the best in the business.

The EF planes for their higher prices include a very nice hardware kit with carbon wing and stab tubes and wing bags. It is also so large that not many 50cc planes can really handle it.

The WH planes require a hardware kit, which is about $75 more (IIRC). Or you can supply your own.

If I had one I would use an 80cc engine (weighs the same as a 50cc + cannister). The fuse on the EF Yak and Extra is roughly the same size as the 80cc Hangar 9 planes.

The WH planes will certainly tumble better due to the relatively shorter fuse, and they float better because they weigh less on about the same wing area. Both are very good at IMAC-type flying.

Both companies are very good at customer service and try very hard to keep their customers happy. Tom takes the next step and actually sponsors his own forum here on RCU and posts many times daily.