在ASP中维护html片段的最佳方式。NET MVC返回ajax调用

i'm looking for a best practices type answer here. basically i have a very chatty application which will be returning bits of data to the client very often. the bits of data returned eventually will end up being html added dynamically to the dom. so i'm trying to choose between the following 2 ways:i'm looking for a best practices type answer he