I use an old version of cutehtml that didn’t have the 30 day trial. I also have cuteftp but never tried the built-in editor.
I’m not familiar with spry but a quick review of the spry site shows they’re javascript libraries.
I guess the best way is to build a test page, upload it to your server and then visit it to see how fast it loads. Make sure you empty the browser(s) cache first to get accurate results. Can’t beat a real world environment for testing.