stylus! stylus! stylus! Surface pro vs Wacom connecting pad!!!

I am a finance student and have to write a lot of equations, draw graphs and i love to doodle as well... I started a post to find out if surface can take over laptop but a public view is that it wont. so i want to know is surface pro having stylus is the way to go or should i just buy a WACOM connector and use it with my normal lappy??