Right now Cloudant offers a full text search. You can build that into a CouchDB on your own too, but it's an add on. I've been meaning to take a crack at installing it on a Raspberry Pi I have CouchDB 2.0 running on but I've not done it yet.
They might also have an enhanced version of the "Fauxton" DB manager. It's been awhile since I've logged into my account there so I don't recall how close in features they are now.
I think they have their own authentication routines that may have some advantages for some users.
Aside from that they make it really easy to just start using it. If you wanted to work with really big data sets Cloudant would be a pretty good option because you can skip all the DB setup work and have instant access a highly scalable platform that lets you get to right to work.
> If you wanted to work with really big data sets Cloudant would be a pretty good option because you can skip all the DB setup work and have instant access a highly scalable platform that lets you get to right to work.
I think one need to state it more clearly with cloudant you get a hosted solution SaaS, they will scale better then you, have better backups, and will be able to rebuild a view quickly, while you are deleting logs to rebuild it and struggling to get performance out of your vps.