Hi,
For general purpose work I like genuine e-z-hook cables. I like the XR size. They are quite substantial.
I have been very happy with the quality. Really well made. Expensive in my opinion worth the money.
Digikey number: 461-1159-ND
For other leads I like to make my own.
Mueller BU60 clip (Digikey 314-1033-ND)
Insulator (Digikey 314-1038-ND) or (Digikey 314-1037-ND )
Banana Plug Johnson (Cinch) Digikey J145-ND
High voltage flexible test lead wire (surplus)
Very specific, again expensive, but very good.
Regards,
Jay_Diddy_B