I think you need to ask yourself some more questions.
If you have children - get something that can be cleaned easily.
If you have pets that get on the couch - again, get something that can be cleaned easily.
Do you want a sofa that can convert into a bed?
How humid is your climate - think of the upholstery and possible mold/mildew if the sofa is not in a location where there is good airflow. If you live in a dusty climate, find one that can be wiped or vacuumed easily.

MY first consideration is if the couch is comfortable to sit on!