well both are very good.. but somewhere in anime (when sharingan is introduced) sasuke says something like "Only a few chosen members of the uchiha clan can get the sharingan"

so.. basically not all uchiha's have the sharingan whereas all Hyuugas have Byakugan.. and wouldnt it be nice to sense movement perfectly and having a nearly 360 degrees focused vision? well its hard to say.. theyre about the same.