what's the best great building to produce medals in forge of empires

If you read through all I've written above with no context of the game, you might thing 'boy, those medals sure are difficult to get in this Forge of Empires game.' Except I just invested 370 FPs into a friend's GB (ALL of which I'll get back thanks to my Arc) and the game will kindly give me 14k medals with it. Must've gotten like 2000 FPs from fighting and. Some of my neighbors were freaking animals, I've completed about 1,000 GbG battles this week to win the first place. Hey, look, I just won PVP tournament in PE. You could have an emissary give you a fp/day. Special buildings, which give you other things as well - fully upgraded Yggdrasil - 30% attack (actually amazing), 8 forge points (great amount for 3x3 building), 20 goods and. Special buildings - upgraded victory tower will give you (drum roll) 36 medals/day in CA. Great buildings (Blue galaxy will produce whooping 414 medals at level 10). Any medal-producing building seems to produce laughably small amounts of medals.

I'm curious, why does it seem like the game is putting so much value behind medals in certain aspects of the game, while valuing them as trash in others.

What's the best great building to produce medals in forge of empires