Well, this is as good of a time as any to dump my knowledge on the subject.
I love dot grids, because each page has the potential to be either grid, ruled, or plain, depending on how seriously you take the dots. Having now gotten used to the various ways of using dotted paper, I don't think I could go back. If you are satisfied with other ruling methods, then you have many more potential vendors, but I am not.
So that leaves these contenders: leuchtturm1917, rhodia, behance, field notes, scout, dotgrid.co, whitelines, ecoqua, monsieur, and nuuna. Vendors seem to come and go, as notebooks seem to be a bit of a fly-by-night sort of business.
Behance and nuuna have that "fly by night" feel and seem difficult to get ahold of in the US (e.g. through Amazon, etc), so I have not tried them. Traditionally leuchtturm1917 has had this problem, but their US distributor seems to be straightening it out.
Scout and dotgrid.co only come in something like Moleskine's "cahier" configuration (e.g., not hard bound). These might be worth trying, but I prefer perfect-bound.
Field Notes only sells in "cahier" configuration, and their only dot grid product is on waterproof/fireproof/everythingproof paper. I hear they work well with pencil or ballpoint pen but the ink from my trusty G2s doesn't absorb well into the paper, so I will just be getting ink all over the place.
Ecoqua sells a glue-bound notebook with a soft cover and no pocket, so it isn't really Moleskine-equivalent in its featureset.
Whitelines is interesting because the lines/ruling is actually brighter than the paper itself, which scans well. However, their Black Ocean notebook is missing a pocket in the back cover, which is an important feature for me. I will probably pick one up eventually. They do have some nice pads though, including offbeat paper like isometric.
Monsieur is a weird size (not very pocket-friendly), and seems to have some supply issues.
This leaves the Leuchtturm1917 and the Rhodia. In my experience, the Leuchtturm1917 is smeary with G2 pens, but is otherwise perfect. The Rhodia's paper is perfect for the G2, but because the paperstock is so thick, the notebook feels a little thick in the pocket. I tend to alternate between these two notebooks.
I have also looked into abusing the on-demand book publishers to create notebooks, but it seems self-published hardbound pocket books are not a thing. Things like boundforanything.com get pretty close, but you're still missing core features like a ribbon, elastic, and a rear pocket.
tl;dr getting a notebook right is more difficult than it looks, rhodia and leuchtturm1917 come the closest for me.