If you decide to use blogspot/blogger as your blogging platform then you have advantages to use google own widget/product and add them to your blog. Its more safety, so I suggest you if it’s possible to always use blogger official widget. However, not all widget you need listen on blogger widget. You can use 3rd party widget, but always make sure the code source is trusted and harmless. After all, you don’t want virus or malware on your template, do you?. :D.
At early stage, beginner blogger always want their blog look ” pretty and colorful “. But, that’s not necessary and effective. What you need is a simple and clean lay out so your blog will loading faster, engrossed readership and don’t make them lost. So, here’s my list of widgets that beginner blogger should add, IMHO of course :D.