Get both, at least the Blood Purifier (SP) and some Rife machine if you can afford it. The SP never stops to amaze me in its simplicity and ability to fix issues that other machines have trouble with, very difficult to penetrate flowing blood with frequency yet microcurrents are doubly effective due to the bloods conductivity.

EDIT -

I frequently use the SP while running Rife scripts, especially for things that use the blood stream for replication purposes; malaria, bartonella, rickettsia, etc...
The SOTA unit is shielded so it can be used at the same time as the MP5, not sure about any other model...