Question normal

I will be starting my first year of internal medicine residency in a few months, and am currently in the process of resource-hunting.
Based on my research, MKSAP18 is one of the highly-rated resources.
Would it be optimal to stick to this resource for all 3 years of residency, or should it be supplemented with other texts such as MedStudy, Harrison's, Davidson's etc.?

Where do texts such as Harrison's and Davidson's come into the studying equation?

Thank you for your input!