[qwertyuiop924]

That's true, but the practical effect (having access to application internals, interacting with live program state, the ability to connect to a live program and hotpatch it, even if it's running on a remote server (but you'll really want the source files if you're doing that, and you should be sure to upload the new sources/binary to the server you just hotpatched, or you'll be in for a shock when it reboots), and so on) is exactly the same, and they mostly share the same capabilities (AFAICT, Nightlight might have better autocomplete than SLIME/Geiser, but other than that, I can't think of anything).