I know its early, but I am debating who to breed my mare to next year....these are the two I am contemplating.

This is the mare https://www.allbreedpedigree.com/leading+asset

She has been crossed on a son of Frenchmans Guy a few times and had nice foals, but looking at switching it up next year.  Thoughts?

Both would be 23 next year.  They may not even be fertile by then.  

Frenchmans Fabulous

Both are excellent choices, but because of the Special Effort I am partial to Frenchmans Fabulous.

I have a stud colt this year by Fab, out of a Special Effort daughter. I also have a Frenchmans Guy daughter out of a Special Effort daughter, so I am partial to the cross.

Either would be a fantastic choice, looking at your mare's bloodlines I'd lean SBL since she does have a lot of run in her.