The best way to get blueprints for most Great Buildings is through a 1.9 thread. If your Guild does not have1.9 but uses swap threads. be aware that the players with the greatest daily Forge Point flows will alwasys take the top reward spots. They usually know this, and hope the other players either are unaware, or do not care. The one way to thwart that is to always follow the same person. So you work each others GBs far more than average. Usually snipers love players who use swap threads. Swaps can be of value for very new players..
But best to find a Guild that has an active 1.9. and does not allow swaps. Because half the Guild using swaps means the 1.9 will be slow as cold molasses.
The one main exception to the above is when starting Arc. finding a Guild with a stron Arc program is best. i started my own Arc clubs. and was able to work together doing swaps to get blueprints through the first 28 levels.Even after level15 it is faster and more profitable to use 1.9 threads.and seek P5 positions on high level Arcs for best BP results.
And never do the two for one swap in the Blueprints page. (unless you really do not care about future results, and just want to push it now!)