control has been around for quite some time and provides rich and mature functionality that covers a large spectrum of user case scenarios.
is a control that addresses some of the limitations and deficiencies that we have identified in the RadChart implementation over the years (we chose to implement a separate control in order not to break backwards compatibility).
There is a help topic
that compares both charts and describes their most important highlights. As my colleague Giuseppe mentioned, some of the RadChart features are not available in RadChartView yet. That's why we will continue supporting both of them and we are not planning to change this in future.
As to the custom gridlines - probably you will be mostly interested in using RadChart since annotations are supported with it.
the Telerik team
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