I think this post and all of the links contained in it will help answer your questions:
https://communities.sas.com/t5/Administration-and-Deployment/Using-SAS-Studio-or-Enterprise-Guide-for-new-users-in-SAS/m-p/393447#M10294
I understand the latest version of SAS Studio (3.7) allows you to read EG projects. Each SAS interface has its advantages and disadvantages. I'd suggest there is room for both, particularly if you have been using EG projects a lot to date.
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