I use QuickBooks Online (QBO) as I have found it to be the most versatile when it comes to different industries.  There are so many applications that can integrate with it and, for the most part, my clients can have 2 accounting seats in their account so they don't have to worry about if I want access, if they want access or if their accountant wants access.  Everything is updated regularly so no one is looking at old data or having to worry about things being "undone" when trying to merge information.