Azure Basic & Standard VM.

I would like to mention difference  between Basic Tier and standard tier VMs in the Azure

1.  The basic tier of Virtual Machine sizes has similar configurations to their Standard counterparts with up to 27% lower prices and do not include Azure load-balancer and Auto-Scaling.
2. These sizes are globally available in every datacenter except in China.
3. Availability: Basic tier VM is only available on A0-A4 instances, standard tier VM is available on all size instances
4. Disk IOPS: Data disk IOPS for basic tier VM is 300, lower than standard tier VM which has 500 IOPS data disk.
5. Price: Single tier VM can have up to 27% less in price than standard tier VM.
6. Feature cut: Basic tier VM does not include load balancing or auto-scaling. For basic tier VMs, you can add those to an availability set for high availability, and implement your own load-balance mechanisms.
7. CPU: Standard tier have better CPU performance than basic tier
8. Switching between Standard and Basic: If you’d like to switch an existing Standard Virtual Machine to its equivalent Basic tier, it’s easy to do from the Configuration tab on your Virtual Machine dashboard. Select a different size and save your changes. Note that this will require a restart to your virtual machine.if you’ve already configured the Azure load balancer or Auto-Scale functionality, you won’t be able to downgrade to one of the Basic VM sizes until the configuration is removed. Once there is no load balancer or Auto-Scale configured, a Basic VM size can be converted to a Standard size following the same steps above.
9.  Basic tier does not provide an Azure load-balancer with the size, doesn’t mean you don’t get the same SLA as the Standard instances. You can still deploy these sizes into Availability Sets. Deploying two or more Virtual Machines in the same Availability Set offers the same benefit as standard instances, with availability across these instances showing 99.95% uptime. More details on the compute SLA can be found here.