Understand pieces, flexibility, connections, and moving costs.
The short answer
Choose modular if you expect to move or rearrange and the individual pieces are manageable. Choose a fixed sectional if its layout and delivery route are already settled.
A conventional sectional is generally designed as a set configuration. A modular sofa uses individual units that may be rearranged, though the available arrangements vary by model. Some products fit both descriptions.
Where modular helps
Smaller pieces can be easier to take through entrances or move to a new home. Reconfiguration can help if your living room changes. Check the size and weight of the largest unit and whether replacement modules are available.
Where a fixed sectional helps
A fixed layout can be simpler to choose and may feel more cohesive. It may cost less than a comparable modular system, though prices vary widely. Check the chaise orientation and access route before committing.
Questions to ask
How do pieces connect? Can every module be freestanding? Are covers replaceable? What happens if one unit wears out? Can you buy matching pieces later? Do all components fit the delivery route?
Choose based on your plans
If you move often or expect to rearrange, compare modular systems. If the room layout is settled and the fixed sectional fits, compare total cost, comfort, and construction instead of paying for flexibility you will not use.
Ready to measure?
Check the size and the full delivery route before ordering.