Number of available lenses is a big decision factor while choosing your interchangeable lens camera. When we look at the available lenses for these two cameras, we see that Panasonic GF7 has an advantage over Fujifilm X-A2 There are 65 lenses for Panasonic GF7's Micro Four Thirds mount, on the other hand there are only 24 lenses for Fujifilm X-A2's Fujifilm X lens mount.
Another important factor is the availability of image stabilization. None of these bodies have sensor based image stabilization so you have to buy lenses with Optical stabilization feature. Currently there are 7 lenses for Fujifilm X mount and 17 lenses for Micro Four Thirds mount with IS.