I had one of the original 12 Baby Drums and it had serious problems with the conveyor motor gear constantly breaking under load. After no resolution from Grizzly I salvaged parts off of mine and threw the carcass away. I think there is a fix to that problem now so go figure. If that Baby Drum still had that conveyor problem I'd stay far away from it but I think that issue has been resolved.
After I dumped by Baby Drum I bought the Grizzly 10 inch the first year they offered it. It is okay at best. The sandpaper is a nightmare for me to load on the drum. I have had to replace the outfeed roller arm and associated brackets due to them wearing out. Not too big of a deal there. It doesn't have much power but it does sand lams fine enough - which is really all I use it for.
I'm not overly impressed with my 10 grizz but I gave something like $310 for it and only use it for lams so I get by with it. It does seem to cut square and parallel without issue.
If I had it to do over again and IF the baby drum conveyor issue is truly resolved - I'd own the baby drum over the 10 inch. With the money I have wrapped up on both I really wish I would have just bought a bigger, better unit to begin with however.
Good luck with your choice.