So there isn't all that much to say about FTP clients, they are piece of software that helps you manage your files from your local machine to a server environment. In essence it has a simple job basically moving the files around while we keep trust that under the hood it supports most of the protocols (FTP, FTPS, SFTP, WebDAV, Amazon S3...) in order to make our lives easier.
So, when it comes down to it, the basics are the same, but the difference, for most people (developers), is in the workflow, and that comes down to speed and comfort of performing those file managing tasks.
I've been using FlashFXP for 10+ years and Transmit 5+ years (very frequently in the last two), so I believe I can give a pretty good impresion on how those two stack up.
One side note, both of the FTP clients are platform-only which means that FlashFXP is Windows, while Transmit is Mac OS X (now macOS) based. Some say its like comparing apples and oranges, right? Right? Thank you! Thank you! I'll be here all night.
True, the "eco systems" are different but the point is workflow and advantages and downsides of both apps. (Даље)