I too just went through this decision making process for a
grapple I built. My original plan was to build a 66" wide one with 2 lids. I was talked out of that by some of the members on this forum and ended up going with a 48" wide on with a single lid. I also installed a diverter valve for the third function. Some of the reasoning for using a narrower
grapple was for digging rocks, which I thought I would never do since I have an excavator for that purpose. However after having used the
grapple for a couple of weeks, I have indeed used it for digging out rocks and some were very big. It's just easier to use it, than to go and get the excavator and drive it to the location. I was glad to have the narrower
grapple for that purpose. I have also used it to grab a few trees by the end and pull them out of the bush. I think it is better to have a single lid when doing this, so that the load is centered on the
grapple. With a dual lid you would be grabbing the tree on one side of the
grapple and the entire load would be on that side.
On the flip side there have been times where I think a wider one with dual lids may have been better. Like when picking up piles of stuff (other than branches which cling together in a big mass anyways) like small roots that have been raked up with the
grapple and pushed into a pile. I end up with a lot of soil mixed in with the roots. This stuff doesn't cling together as well as branches, so a wider
grapple with 2 lids could pick up more material.
So far I've been very happy with the narrow
grapple and have found a LOT more uses for it than I thought I would. I also like having the single lid for pulling logs out of the bush. Although a wider one with 2 lids may better for some things I think I will stick with the narrow one and single lid for a while. My single lid is only 24" wide and if I find that I'm doing a lot of work that involves things like the root / soil pick up, I will simply make a much wider single lid that I can mount on the narrow
grapple, in place of the 24" lid that is on it now. It would be a simple matter to make the extra mounting brackets and then I would have the option of using the narrower lid or the wider one. I doubt I would make the
grapple wider though.
In the end I think it depends on what you plan on using yours for.
Here are some pics of mine. The last pic shows the knob I made with the diverter valve switch in the top of it.


