Which building upgrades gives the maximum points in COP and hourly tasks?

Buildings that requires crystal gives maximum points.... then more dragonite more points.....Then maximum gold more the points ... Then more the iron more the points... Rest remain same

The best buildings for CoP and Hourly building challenges are the dragon buildings. After that, the individual war rooms and the enhancement camps for each troop type, as well as Supply Station and Spy Agency. All of these buildings need crystal to upgrade.