either Ezio or Connor, as whilst Altair may be the first assassin we play as, we see immediate improvements of style and methods for things such as fighting and free running. whilst we haven't played as Connor yet, one could only imagine that his skill will also be much improved since Ezio. Ezio also uses much madami advanced and powerful weaponry compared to Altair, though it was Altair that learned many formula's to creating these from the apple. Connor also may use a tomahawk, but these are much easier to use in combat and much easier to master, and will madami than likely have developed a better fighting style. the range of weaponry which Connor has at his disposal is also of good quality and is very useful, such as the rope dart