Its totally depends on your ability, dedication and daily hours you can give for learning. Azure basically comes with three course modules:

1. Developing Microsoft Azure Solutions: 70-532
2. Microsoft Azure Infrastructure 70-533
3. Architecting Microsoft Azure Solutions (70-535)

So you have to make your mind accordingly which course you wanna go for. For each course you need at least 40-50 hrs to learn the theory as well as do hands on. 

HI Kumar, 

Its not mandatory to attend a course or a class room study understanding of the concepts and regular practice of AWS can mould you to get certified. Its better to go with AWS whitepapers which is present in AWS website and the questions will be from it. Mostly all the certification questions will be scenario based...You can get the materials from web..

Thanks and regards 

Hi Manjunath,

Listing 'Best' features would be quite vague, As every feature can be termed as 'Best' by their Marketing Team.
Hence I would present you with a list of features unique to Azure that distinguishes Azure from the rest of the competition.
1. Microsoft Azure has the largest number of Data Centers/Regions and connectivity fiber stretch (more than AWS and Google combined).
2. Microsoft Azure is the only major cloud computing vendor to have seamless Proprietary Hybrid Cloud Solution with enterprise-grade support. (Public Cloud - Microsoft Azure, Private Cloud - Microsoft Azure Stack, Service Providers - Microsoft Azure Stack, Government Cloud - Azure Government)
3. Microsoft Azure Leads the open and Green Data centre initiative 'Open compute project'.
4. Microsoft Azure is the only vendor to have enterprise-class native Cloud solution for almost every business use cases- OS, Database, ERP, CRM, Mail Service, File Server, Collaboration Service, communication Service, PaaS, container etc.
5. Microsoft Azure is the only cloud vendor to top Gartner Cloud leader quadrant in more than 10 categories.