Style.Triggers vs ControlTemplate.Triggers

Update from Background does not change of button C# WPF the Button in windows 8 does use a ControlTemplate.Trigger for IsMouseOver so there are cases where ControlTemplate may need to be completely overwritten to get the desired functionality. So that would be a case where you need to use ControlTemplate triggers over Style triggers.

You may not always need to override the default ControlTemplate. Say you have a control and you want all the MyTextControl to have a a blue Foreground when IsMouseOver is true and leave everything else as default. You could use something like this:

<Style TargetType="{x:Type MyTextControl}">    <Style.Triggers>        <Trigger Property="IsMouseOver" Value="True">            <Setter Property="Foreground" Value="Blue"/>        </Trigger>    </Style.Triggers></Style>

If you wanted to use the ControlTemplate.Triggers you would need to copy the default MyTextControl Template or else you would end up with no visual.

Aside from that I think the only difference is that Style.Triggers has a lower precedence than ControlTemplate.Triggers (Precedence documentation). But that would only matter if you use both trigger types.