For a prism I like the 45 degree, but as someone mentioned it does add weight and size to the kit. I am almost always on a tripod, and the waist level is fine there. Personal preference.
I have prisms with and without a meter. Initially I thought I wanted the meter, but it is cumbersome to use since it isn’t coupled to the body. An incident reading gives me everything I need to know. For a company with such brilliant design capabilities, the way the meter was added was not up to standards.