So I just recently got Anno and I love it so far. Right now I'm recruiting Managers, thus filling my City-center with skyscrapers which looks amazing, especially with the edges of the city still low-tier (the small flat-buildings look very comfortable!)

So from an aesthetic perspective, I've been wondering if it is better (economy-wise) to eventually upgrade all buildings to the highest tier or if you can leave a portion of them low? Will it hurt the economy greatly?

Also, I've learned you can change the color of your ship as a ubisoft club reward, but I don't know exactly what that is or how I should proceed. Any help is welcome!

Thanks in advance!

EDIT: Thanks for the answers guys! Now I'm trying to get high income for building the fusion reactor, so the question is: Can/should I upgrade all buildings available for promotion at once?