Springs usually do a better job over time, and more uniform with support. If going without springs, density of foam counts. 2.2 or higher on foam. Fibers / Feathers break down. We had an old leather chair with a very good seat cushion, of dense foam. Problem was the chair support underneath broke down. Needed new supporting structure. Kept the foam for fitting in furniture that lack support in zippered pockets. Usually arms have the least quality with foams and fill. We just got a new couch 2 weeks ago, and it was well filled in the seat cushions, with spring supports underneath. It took 1 week to break in (weighing 200lbs) of 10+ hours each day on weekend. Now the cushions feel just right, not showing any indentations from being seated. That's my 2 cents.

I don’t know if you do, it may just be too overwhelming. But if you want more options. Try pottery barn also. They have Amazing options.

I wouldn't base my decision on spring vs foam cushions, I would rank frame quality and fabric higher. Cushions eventually wear down regardless of spring or foam construction. I think it is easier to replace a foam cushion after ~7 years compared to a custom spring replacement. They both have a different feel to consider. Spring cushions feel more like you are sitting on top of the sofa instead of sinking in (think about a movie theater cushion, they often have springs). Springs can last longer but are also more susceptible to other issues (noise when moving). If you have an Ethan Allen near you, they usually have a sofa with numerous cushion styles to test our, including springs. They charge $200/piece extra for springs. I wouldn't recommend Crate & Barrel due to quality. C&B is a notch up from IKEA, but not great. They don't use mortise & tenon joinery, the frames are much lower than the back cushions (cost saving design but doesn't support cushions and is uncomfortable). They don't use batting on the outside of the frame so it quickly shows the wood frame through the fabric. Their fabrics are unusual and if you pick an upgrade from the stock fabric, the price becomes comparable to a higher-end sofa. West Elm is about the same and they often use pine for frames (softwood w/ lower density compared to hardwood). I've had all these brands and have been happier with Pottery Barn and Ethan Allen. Have you looked at Rejuvenation or Williams-Sonoma? I've priced nicer custom sofas for the same price as C&B. Hope that helps!