So far the multipoint server looks easier to know where/how to enter the cals for the RDS/Multipoint sessions. Remember you need multipoint cals and Windows server cals IF you are in a normal network, but in a SBS Standard one, the Windows cals are covered by the SBS standard cals.
Don’t forget to watch this video as well: http://www.youtube.com/user/msmultipoint#p/u/4/tftu_AqcCgI