When comparing Transmit 4 vs Default Folder X, the Slant community recommends Transmit 4 for most people. In the question“What are the best power user tools for macOS?” Transmit 4 is ranked 4th while Default Folder X is ranked 39th. The most important reason people chose Transmit 4 is:
Exchange data with FTP, SFTP or WebDAV servers or your Amazon S3 storage.
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Pros
Pro Fast and powerful file exchange client
Exchange data with FTP, SFTP or WebDAV servers or your Amazon S3 storage.
Pro Supports Amazon S3 & WebDAV
In addition to FTP, allows exchanging data with SFTP or WebDAV servers or your Amazon S3 storage.
Pro Enable a server connection as a normal disk in your Finder
So you can access your storage without the Transmit client.
Pro FTP Sync
Scans local and remote for difference and only transfer modified files. It's not rsync, but it's the next best thing
Pro Can enable a server connection as a normal disk in your Finder
So you can access your storage without the Transmit client.
Pro Directory assistant Finder Integration
From the Open / Save file dialog, you can access your recent, favorite, and open folders. Includes a menubar item and can add to the Finder toolbar for quick access.
Pro New features are intuitive
Many of the features provided by Default Folder are quite intuitive and quickly become very useful. When a save dialogue is open, just click on an open Finder window to change the current path to that directory. Integrated Quicklook previews make selecting files in the list view much easier, and Spotlight tags can be added directly from the save dialogue.