There are several advantages for both. The large scoop removes more material form the target location, thus the possibility of getting the target on the first shot is a good one. So no multiple tries. Disadvantages: Depends on your physical abilities, the larger one will weigh more with the matrix brought up from the target area. Thus you can get worn out faster or you many struggle with a full loaded scoop or it may get stuck in the target area matrix. Wheather veining this usually occurs when you have a strong incoming or outgoing tide and it will try to pull your scoop in the direction the tide is moving as you walk with it in the water. I have had several occasions where it was so bad I could only detect in water up to my knees. This can occur with both large and small scoops but is more pronounced with the larger scoop. If you are detecting in a lake, pond, or calm waters great. The disadvantage with the small scoop it may take multiple tries to recover your target, this is bad if you have a strong current refilling your target hole while you are trying to recover the target! The advantage is that it's lighter, so you may be able to hunt for a longer time period. You won't have to struggle to free up the scoop if it get's stuck in the target recovery area matrix. As you can see from my avatar the scoop I use is of my own design it's name is Scoopzilla, it is HEAVY and sometimes after 6 to 8 hours in the gulf, people say I walk crooked and it's a real drag to carry it back to my truck! But it works for me. Also when I plant the scoop in the target area matrix, my guestimation is that my scoop weighs at a minimum of 35 + pounds and to pull that up to the surface is really tricky. But I have worked that out and have been using this scoop for about 8 years now. I hope this answers some of your questions.