Best Sectionals with Q&A

I will need two of these couches to make it more like a sectional. One with the chair arm rest on the right and one with arm rest on the left is this possible?
Hello, I am interested in purchasing the 126" L-Shaped Off-White Modular Sectional Sofa Chaise. Could anyone comment on the quality of "milky way" and "off-white" in VELVET material? And what is the difference between the two colors? How do you define the comfort level of the sectional?
Is the seat cushion only filled with foam or does it have spring support in the middle? I ask from the perspective of support, firmness, and longevity

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