Screw on or bolt on CD

Looking at a BMS 5530/5531

One is screw on one is bolt on

I would like to try it on a few different horns of both screw on and bolt on

So , which is the least evil?

Should I get a bolt on CD and use a screw on adapter for those horns , or get a screw on and use a bolt on adapter for those type horns

Any help much appreciated