So, I have been researching for a bit, and have decided to purchase a Masterbuilt electric smoker for my hubby for Christmas. I looked at the 40in at Sam's, and it seems HUGE. But I hear people talking about needing the space. Can someone help me out with the differences between the 30in and the 40 in? We are a family of 4, but do cook for parties occassionally (10-12 people) Thanks!