Talking about soap/bowl profiles:
The D.R. Harris refill puck has a more squarish (rounded) bottom profile.
ToOBS / GFT are not like that. Ditto for the C&E pucks. Their profile is slimmer at the lower end.
Wooden bowls follow the profile of the soap, of course.
The Pens soap/bowl I think is different, the Floris one may come much closer to the ToOBS / GFT.
Others: Plisson porcelain bowl is rounded squarish, something like D.R. Harris.
Joris refill sells through the same company but the refill puck profile is not exactly the same as that of the Plisson.
The MWF ceramic w/ lid is very good for SV refills, if I remember well.
Don't have them all here to put them side-by-side and explain in detail.
Talking about soap refills (scent, quality):
You should know that already but best to avoid ToOBS/GFT/T&H, all veggie and not good performers.
Pens is ok but Floris is better. Both veggie as well.
D.R. Harris keeps the pride up and resists the unlawful pressure of all these "mr. sorry state" pro-eco groups, those who deliberately wish to make our lives much more miserable. Tallow is (and will always be) king, even if it is third or fourth in the ingredients list.
You can always take soap in bulk (soft or hard - Dusy Kabinett, LPL, etc.), cut it and put it in a nice wooden bowl.