Can somebody give me example of ui:menuTrigger and how it is different from ui:menuTriggerLink? Current document doesn't have any example for ui:menuTrigger. Any help will be appriciated.
There's really no reason to use ui:menuTrigger. You should always use ui:menuTriggerLink instead. Here's an example with explanation for a component that uses ui:menuTriggerLink:
https://developer.salesforce.com/docs/atlas.en-us.lightning.meta/lightning/aura_compref_ui_menu.htm
It is not documented but I have used ui:menuTrigger for using button and custom template instead of link.
<ui:menuTrigger>
<!-- button or custom template -->
</ui:menuTrigger>
