Sofa beds will normally be larger in dimensions, and will likely be preferred by most. People looking for a bed for couples sleeping overnight would normally opt for a good sofa bed. However, futon frames and beds are less massive and weigh less than standard sofa beds. Whether you choose to have a spare futon bed or a traditional. Sofa sleepers are bigger in size, but they are more comfortable due to their construction, upholstery and foam padding. Futon frames are relatively light-weighted, less massive and usually easier to move than sofa beds. The converting mechanisms are also easier for us.