When comparing Cyberduck vs ForkLift 3, the Slant community recommends Cyberduck for most people. In the question“What are the best FTP clients for OS X?” Cyberduck is ranked 2nd while ForkLift 3 is ranked 7th. The most important reason people chose Cyberduck is:
Sticks to being a simple FTP app without adding more features. No need for other file managing features that are not related to FTP purposes. A client that is simply a nice GUI as apposed to just using a command line.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Dedicated FTP app that performs well
Sticks to being a simple FTP app without adding more features. No need for other file managing features that are not related to FTP purposes. A client that is simply a nice GUI as apposed to just using a command line.
Pro Easy and intuitive user interface

Pro Free to download
It's free to download from the developers according to the FAQ, however donation models are not allowed on the Mac store, which is why it costs $23.99 there.
Pro S3 and WebDav
Browses Amazon Simple Storage Service like your harddisk and supports about any webdav service like box, dropbox, google drive or your own personal nas.
Pro Best UX/UI'd file manager on the market
It's just a perfectly crafted app, try and enjoy
Pro Rewritten in Swift
Forklift 3 is a significant update from FL2, having been rewritten entirely in Swift.
Pro Optional dark UI
In addition to the default Mac gray UI, Forklift 3 offers an alternate "Dark Mode" featuring light text elements against dark backgrounds.
Pro Connect to and mount lots of storage options
FTP, WebDAV, Amazon S3, Backblaze B2, Google Drive, Rackspace CloudFiles, SMB, AFP, NFS, VNC, etc.
Pro Easily toggle hidden files
Pro Built-in application remover
Cons
Con Upgraded to High Sierra, and there's an iCloud conflict when using Cyberduck
Con Like Apple, it does not standardize file size. Mixes up KBs, MBs GBs in the same column which makes it very difficult to review file sizes
Con Like Apple, shows the date of Today's file as "Today" instead of the actual date
Con Does not sync the "selected" folders (i.e. highlighted ones), but the "current" folders (i.e. the top of the visible tree.)
Con Does not show the fixed tree section in the left pane of a dual horizontal panes
