Broad question is: Is there anything Telerik Reporting can do that SSRS (2005) cannot?
Specifics: We're looking to migrate our current Reporting infrastructure from in-house ASP.NET + Crystal (VS Edition) to something else.
Ignoring the cost factor (we have a Telerik license), is there any pros or cons to going with Telerik over SSRS?
Key elements we need are:
C#
before passing it to the rendering engineAny experiences or sites that point out advantages or limitations (with either engine) would be greatly appreciated.
SSRS is a server-based reporting system whereas Telerik Reporting is purely an embedded reporting tool. You should compare Telerik Reporting to SSRS ReportViewer control in local processing mode, not the whole SSRS system, unless you intend to use the SSRS server too. I think this is the first question to answer: you should evaluate the pros and cons of using a report server.
The usual reason of choosing embedded reporting is to avoid a server dependency. If you are an application developer and deploy your application to multiple sites, you would have to support multiple SSRS installation in addition to your application. Telerik reports compile to a dll that you can deploy with your application easily.
Generally, server-based SSRS is more feature-rich than Telerik reporting, especially the SSRS 2008 tablix is handy. I think that Telerik Reporting has supported crosstabs only from Q1 2009. It does not support interactive features like drilldown. You should see the known limitations of Telerik reporting and also the substantial improvements in SSRS 2008 compared to SSRS 2005. On the other hand, ReportViewer in local mode understands RDL 2005 only, so you are limited to SSRS 2005 features.
Now, it is easier to look at your requirements.
Generating reports from a custom ASP.NET application
Scheduling reports
Email reports on demand or on a schedule
Pdf output
Drilldown html
Massage the dataset in C# before passing it to the rendering engine
ReportViewer supports two types of data sources in local processing mode: a dataset that contains an ADO.NET DataTable object or an enumerable collection of business objects. ReportViewer Windows Forms also supports binding to instances of System.Windows.Forms.BindingSource and to System.Type. Report Viewer Web server supports binding to an instance of System.Web.UI.IDataSource.
Given your key elements, and assuming that you are doing internal reporting inside a corporate firewall, I'd definitely recommend using an SSRS server. Try to get one SQL Server 2008 licence or use SQL 2008 Express as a reporting server. But if you absolutely have to use embedded reporting, Telerik is probably a better choice, at least until Microsoft ReportViewer supports RDL 2008 in local mode. This new ReportViewer should be shipped with Visual Studio 2010.
For SSRS, I recommend reading Teo Lachev's Applied Microsoft SQL Server Reporting Services. Sample chapters are available at the book's site the and in Google Books.
Telerik Reporting has excellent support too. Developing Telerik reports relies heavily on samples and support forums.
I have also written blog posts on embedded reporting and Telerik Reporting in particular.