There are so many variables, including how densely you plan to quilt, your skill level, the thickness of the thread you choose, the particular fabrics, the pieced design.
My best suggestion is to take some scraps and make an improv block. Then try out a variety of thread and see what looks best. you can then use this block to make a pillow or a storage bag for the quilt. Or if it's really bad, you can designate it for animal shelter use. But taking that time to do some trial runs will give you confidence not only in your planned FMQ moves, but also the thread, tension settings, batting performance, etc.