Most people will put the operating system and all of their programs on the solid state drive.
They use the hard drive for data storage.
That is my setup and I have been very happy with it.
My computer boots very quickly and all my programs are quickly opened.
I have not noticed any significant lag time accessing data files.
On the other hand 256 Gb is a good amount of storage.
An alternate setup for a primarily Softplan oriented computer would be to put the program and current data files on the SSD.
At some point you can choose to archive older completed projects into a data folder on the hard drive.
This expedites backups to remote hard drives as you can easily choose between current projects and archived projects.