SqlDataAdapter vs SqlDataReader for DBAs

Speaking to developers about the use of

vs

and reading this: https://stackoverflow.com/questions/1676753/sqldataadapter-vs-sqldatareader Yields little in the way of explaining the effect on SQL Server of switching from

to

. I understand

potentially increases the length of time a connection is open to SQL Server, and that certainly is a concern when it comes to efficient use of pooled connections. Aside from this, what is the effect on SQL Server of using

instead of

? Has anyone observed the effect of this change on SQL Server?