Yes the nomenclature is a bit confusing but I believe toit is the SDK/platform/firmware(?), toitlang is the language, and jaguar is the CLI tool used to bundle/deploy it all onto a device.

As far as I can tell, the combination of all three of the above is the equivalent to tasmota + tasmotizer + berry?

I guess what I am asking for is how does developing on the ESP32 when using toitlang + toit SDK compare to issuing commands against Tasmota using berry?