That pretty much tells me you already get where I was going to come from on your choice. If you have some orders for cf parts you need to fill yesterday, maybe foxeer… if you want to become a ‘cnc guru’ and the orders can wait, maybe mpcnc.
Cutting CF at 0.1mm (4 thou) is doable on mpcnc. However if that’s a big priority, I’d definitely minimize the work area as much as possible, especially the z since it affects xy flex and you don’t need height for sheets.