Should I add an accent chair or a loveseat to my living room?
An accent chair and a loveseat solve the extra-seating problem in different ways, so the choice is best made by seeing each one beside your existing sofa rather than in the abstract.
An accent chair adds a single seat and a shot of character, slots into a corner, and stays easy to move when you rearrange. A loveseat adds two seats and noticeably more visual mass, reading as a committed second sofa that fills its side of the room. One keeps things light and flexible; the other adds seating and weight.
Seeing each beside your sofa shows whether the room wants a light accent or a fuller second piece, and whether the styles agree. DecorViz lets you preview an accent chair, then a loveseat, on the same room photo so you can weigh them directly. The previews show look and proportion in your light.
Related answers: seeing an accent chair in your room and seeing a loveseat in your room.