EXPERT RESPONSE
Here is the general performance rule when comparing T-SQL routines to equivalent CLR routines: Test both configurations with your data on your servers and figure out which one is better.
That said, many people have run performance tests and the general consensus is that T-SQL will always perform better for standard CRUD (Create, Read, Update, Delete) operations, whereas CLR code will perform better for complex math, string manipulation and other tasks that go beyond data access.
SQL Server MVP Gustavo Larriera has compiled the following list of useful links with more information on this topic:
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