Looking forward to joining the YS community!!

I've been doing some serious research on my next grill purchase. I'm happy to say that my new purchase will be the Cheyenne 16" or 20" upon completion of my 9 month deployment in the serving the Navy. I've been a serious smoker for years and ready to take the next step with a serious grill. I really need to know if the 4 inch difference is that significant between the 16" and the 20". I know the price is. I plan on doing pork shoulders and briskets, for family and the occasional get togethers. Please advise.