Jimmy i would be agree 100% with heel forward or 45 degree strokes.
i am against the rolling x and let me explain why.
Person need to use Rolling x most likely if blade do have warped places. In this situation you are unable to do straight x strokes or heel forward or 45 degree strokes.
if this blade warped i would never say Rolling x wasn't the answer.
Now about Rolling x strokes.
I don't think it is for everyone.
When you do rolling x you have to use same pressure all way from heel to the tip of the blade .+ you must have exact amount(number of circles) rolling motion from heel to the tip.+ you must to do same things another side of the blade.
if you miss any of those you will end up sharpening some part of blade more then other.
and that will be a problem to fix
This is why i am against Rolling x motion in any blade except warped ones.
hope this helps.