I have watched many videos on this exact topic and their seems to be several schools of thought. just look to the differences presented on YouTube from these 3 very reputable sources. Keith Kavajecv, Al Linder, and Tom Boley.
Some similarities seem to be 1.)if using a ML rod, you can use braid and 2.)if you use a M rod, use mono. 3.)use a swivel to avoid twists
being I like my Extreme 6’10” MLXF the most and I generally have it spooled with a nonstretch line, I have used this the most. I have also used a MXF with mono. i seem to prefer the first set up, may be mind over matter though.