Difference Microsoft.Activities.Expression vs. .NET Methods

Hi everyone,

here in the forum I’ve read many different solutions for the same problem. Some of you are working more with Microsoft.Activities.Expressions and others are working with .NET Methods. For example: split a string works with Microsoft.Activities.Expressions.SplitString Activity and with the String.Split-Method.

So here my question: What are the differences in a very generic point of view between the MS Activities and the .NET-Methods?