Disclosure: I'm the founder and CEO of ag-Grid.
First, some clarification on the question, ag-Grid used to be called angular-grid, however I presume you meant angular-ui-grid (or simply ui-grid), so allow me to answer ag-grid vs slick-grid vs ui-grid. The answer is ag-Grid.
For reference, these are the sites: ag-Grid, ui-grid, slick-grid
All grids are popular and widely used, each with a community of users.
To give a full comparison is outside the context of a Stackoverflow response, however feedback from the community says ag-Grid is better for the following reasons:
- ui-Grid only works in AngularJS 1.x. ag-Grid supports Angular 1 and 2, React and even native Javascript (no-Framework). So if using ui-Grid, you have only one option for your framework, that's AngularJS 1. Slickgrid is native Javascript (uses JQuery) so will work outside any framework also.
- Documentation for ag-Grid is excellent.
- For enterprise features (grouping, filtering, custom cell rendering, pinning) ag-Grid again wins. The grouping and aggregation feature of ag-Grid is not matched by the others. Slickgrid doesn't have pinning, which was a blocker for me. Only ag-Grid has Excel like filtering.
- slickgrid is no longer maintained by the founder (according to his website).
- ag-Grid is written using pure Javascript, it does not have any libraries as dependencies. ui-grid depends on Angular. Slickgrid depends on JQuery.
- Performance wise, SlickGrid and ag-Grid are on par. However ui-grid performs poorly on large datasets.
- Source code wise, the code inside ag-Grid is very well laid out, so when you need to understand how something works, it's easy to debug in through the code.
- Size-wize, ag-Grid is larger than much of the competition. Circa 1-Aug-2018, the CDN download for ag-grid is 783978 bytes minified..that doesn't include stylesheets. This may be a deal-breaker for some people.
- And lastly, if ui-grid or slickgrid were up to my standards, I wouldn't have needed to write ag-Grid!