Pros and Cons of using Blanket Sales agreements vs Agreements for contract pricing

Hello - wondering if anyone has experienced any concerns with using Order Management Blanket Sales agreements to manage contractual arrangements with customers for subscription-type items combined with single-purchase complimentary items?

Challenges with complex pricing structures(various price lists, customer specific pricing, tiered modifiers(longterm and periodic application).

We sell services and some hardware and contract pricing with client. Pricing may or may not be fixed for a period of time

Maintenance over long periods of time(pricing changes, product add/discontinues)-Concerns with ongoing maintenance processes if using unique price lists and unique modifiers to represent each contract

Usability of blanket form compared to sales order form(data visibility, field/function differences, like sales credits)