We actually built 4 aircraft this year. It began with a canard design but as time went by we thought we'd explore improving our 2018 aircraft.
We did this by building two alternatives - a delta and a conventional wing. The team were clear on which was best simply by running time trials on video. The delta was faster in a line but the straight wing turned around the pylon much faster without losing speed. Comparing like for like and minimising vairables is the only way to find this stuff out. We are priviledged to be able to fly so easily thanks to local support.