The main difference of these two are simply the materials from which they are created. The second is how they look and feel in an interior. Posters are presented as a two-dimensional art that can be hanged with the use of frames. It is a traditional look that is well known and appreciated by many. On the contrary, most canvas prints are wrapped in a wooden frame and have a three-dimensional view that looks phenomenal in any interior.
When displayed, the light that touches a framed print causes glare, which may disrupt you from fully appreciating the art itself. On the other hand, canvas prints come in a matte finish and gives a viewing experience that you can enjoy at any angle.
Of course there are high quality fine art prints available, and some posters provide exquisite details and vibrant colors too. An image printed onto canvas, however, is more saturated and gives depth to the artwork’s appearance. It also provides a painted effect.
For paper prints, the frames are part of the aesthetic and has to match the interior of the room. Canvas prints however are stretched and wrapped on wooden stretcher bars. This frameless effect makes it easier for the art to blend into any design theme. A canvas print also weighs relatively less than a framed print. The bigger the latter gets, the heavier and more expensive it becomes.