I need more space in my development environment and need to shrink my database (or files) in SQL Server. Should I chose "shrink files" or "shrink database" to free most disk space?
If the database contains more than one data file, with the "Shrink Files" options you can choose which file you want to shrink; "Shrink Database" will shrink all of them.
ShrinkDatabase: shrink all files in a database
ShrinkFile: just one file
Shrink Database shrinks all the files in the database, shrink file shrinks only the specified file. For more info you can go to this link also