I think painting the fence panels will ruin the symmetry- currently the panels match the wall in age/texture and both walls look of similar style/age. Painting those fences would look jarring, and out of place. Maybe paint trellis fans instead and attach to both walls ? Personally, I'd paint the gate and posts at the very bottom of the garden to match the decking, as well as a few accents along the sides - trellis/planters/similar.