I know everyone is loyal to their OT's and WSM's. I'm a WSM guy and the difference is how long do you want your low and slow cook to go? And a water pan. I can maintain 16 hours without reloading coal @ 250*F at grill steady on my 18.5 when it's around 65-70*F OAT. My Friends with OT's love them but for long cooks have to add more coal. Nothing wrong with that. I think the 14.5 would be a pork butt cookin' machine.
Weber WSM, Weber GA, Weber Spirit S-320
Charbroil Oilless Turkey Fryer
Wife LuzziAnn 1956 model.
Maverick ET-732, Superfast LSU Purple Thermapen