It sounds like your questions might be more about comparing Tandem’s BIQ (Basal IQ) to CIQ (Control IQ), am I understanding correctly? If so, I outlined some of the differences here: Out of step Basal IQ - #2 by RachelMaraii
For CIQ, you can technically use the temp basal function – but CIQ will still intervene if it sees your trends going up or down.