Crystal makes a low quality window. Why are you even considering aluminum windows?

are you living in a building where aluminum is mandatory? what state do you live in?

This is really a bizarre comparison. Two total different materials and windows designed and marketed for different sets of priorities. A few things that WIndow Pro alluded to:

-Where do you live? Aluminum can be good in warmer climate regions, but not much else.

-What are your priorities? Energy Efficiency? Looks? Durability? Warranty? Budget?

-What type of windows do you currently have and why are you replacing them?

-What are some of the more specific options that you are looking for? (You mentioned grids between the glass as one, and they are available on nearly every window on the market)

From there, you'd be wise to concentrate on one material (ie: wood, vinyl, aluminum, etc) based on your preferences above, and then compare some good products in that material for apples to apples.

I have sold Crystal and they are very much on the low end quality wise. Opposite end of the spectrum from anything Marvin. Were it me there would be nothing to consider. What series Marvin by the way?