Like others have said, the WSM is a fantastic vertical smoker, but won't help you grill.
If your goal is to have a larger capacity smoker and already have a kettle or similar for grilling, go WSM.
If you want a do-it-all cooker and are less concerned about volume or capacity, consider the Acorn and be ready to modify it if you find it has significant air leaks, per brethren JMSeltzer's Man Cave Meals YouTube tutorials.
~ Scott ~
Blue Weber Performer + Craycort CI • Brick Red Weber One-Touch Platinum • Weber 26.75 Kettle • Akorn Kamado • ET 732 • Record-crushing ORANGE Thermapen • UDS In Progress