An "a" 600w driver can be dimmed with the built-in POT,
or with an aftermarket dimmer (only 600h have "a" style with both dimming methods included). A "b" 600w style driver will ONLY have dimmer leads and not have built-in POTs, so if you went with an "a" you'd be good to go. Typically "a" style drivers have no dimmer leads, only a POT, and "b" style drivers have no POT but have dimmer leads. In this instance though, with an "a" version in 600w you'll get all the options.
About WAGO's, I don't use em, so idk. I solder splice my lines together, and then tape em so they don't move around.
Notice the difference in models (a/b) when it comes to having built-in POTs or not..
View attachment 4310351
There's no "Vo" or "Io" adjustment POTs in the "b" version. "V" stands for voltage. "I" stands for current. So "Vo" is voltage output and "Io" is current output.