Does bufferCount or windowCount better handle paginating large dataset streams

When processing a large dataset via RxJS, the goal is often to batch emissions into discrete pages for processing. Using bufferCount(size) is a common approach because it emits concrete arrays, which simplifies the downstream logic. However, windowCount(size) provides an observable of observables, allowing for independent processing of each page as it is populated.

The decision becomes complex when memory management and completion-cycle behavior are considered. bufferCount emits a final partial array when the source completes, which might lead to inconsistent page sizes. In contrast, windowCount requires manual management of multiple inner subscriptions, potentially risking memory leaks if windows are not properly disposed of.

Which operator offers more robust behavior when the source emits data faster than the consumer can process the batches, and how should the final partial page be handled to ensure consistent data structures?