profitability

Hi Everyone,

I'm new to the business end of glazing (very familiar with the trade part of it), I'm interested in seeing what part of the glazing is the most profitable (in your opinion of course). Examples: Windows, showers, curtain wall, storefront, glass railing, etc. Both in the GC world and the typical homeowner world. Thank you in advance, I'm excited to hear our responses. Thank you for taking the time. 

Mig