Telerik's platform is one of the, if not the, most developed and well thought out platforms my team and I have had the pleasure of working with. We have used their Angular components, .net components, and reporting suite and have had success with each. Their support is also top-notch with detailed responses coming back within 24 hours. With a fast-paced development cycle knowing that help is quickly obtainable makes all the difference.

My experience whit Telerik is a passion and hate relationship, has a enormous power and flexibility but whit this make a little confuse use some components or make a custom approach. Reporting has some issue with performance, but for simple things is awesome. Kendo is fair enough for simple things. but has a little problems with performance too.