You are the second person to mention the MA. Please explain why. I see no benefits to a 5th
Without knowing more about how you play, all @Enevhar Aldarion could give you is generic advice. To someone who doesn't play the Spire much, a high level academy is probably worth more than a high level builder. Since you do Spire, a builder is probably more valuable, assuming you don't have enough for an extra expansion, which is almost always more valuable at the 1500 diamond level.Extra slots are useless. Get more fragments in spires now so who cares. Enchant speedup is the only gain and I get catalyst in spires. Just dont see it
An extra builder helps a lot, a small amount of the time. An extra expansion helps a little bit, All of the time. Imagine one extra ancient wonder, or factory, or workshop, 24/7 for as long as you play. I would always pick an extra expansion over something else for the same cost.I can buy a 5th builder which I guess helps the rest of the game or expansion with that 1500. Just hate to leave the cupboard bare