This is a hard question. The first mortar I built was a golf ball mortar. I love to shoot it. I've built a bowling ball mortar. It's a hoot, every time it goes off you can't help but laugh in excietment. I have a 1/3 scale 24 pounder bored for golf balls. I like it, but its like the bowling ball mortar, hard for one person to handle. It takes 2 people to load the 24 pounder into the back of my truck when it's assembled. I'm building some smaller ones now. Some people like something that will sit on their desk and look nice and still be able to shoot them and make a little noise if they want. It all depends on your likes and circumstances I guess. My wife lets me keep the 24 pounder in the living room. That is another issue, you have to have room to store it.