Is it the best?? Hmm.....down to personal choice I think. I like it a lot though, nice quality British hardwood.
Try sealing the sycamore with shellac or thin varnish and let it dry. You should be able to write on it without it sinking in.
Hope this helps
Main difference between sycamore/maple and oak, ash etc is that the first are diffuse porous whereas the second type are ring porous IIRC
If you don't want the growth lines to show through an opaque finish, then use the first type