Hi Santhosh,
this document answer your question: SAP Web IDE - Frequently Asked Questions | SCN
Page 5:
Q:When do you recommend to use SAP Web IDE and when SAP Eclipse extensions?
A:SAP Web IDE is the recommended tool for developing any Fiori and SAPUI5 app. SAP will focus its investment in SAP Web IDE since it provides a simple development process with rich out of the box capabilities. Eclipse tools are still supported and developed. Generally speaking, in the context of building Fiori and SAPUI5-based application, Eclipse should be used more on the server-side development (e.g. service creation).
so WebIDE fist. 不用谢 请叫我雷锋