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The decision to opt for one or the other depends on your needs. Bentley Map Enterprise extends the Map product in several areas.
You can review the differences in the Product Resources listed at the bottom of the Bentley Map web page: https://www.bentley.com/en/products/product-line/asset-performance/bentley-map
The Bentley Map V8i Functional Matrix document compares the features between each product.
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