So its kind of personal note to me, as i usually forget some of key differences over the years
| Semi-Annual Channel (Windows Server) | Long-Term Servicing Channel (Windows Server 2016) | |
| Recommended scenarios | General purpose file servers, Microsoft and non-Microsoft workloads, traditional apps, infrastructure roles, software-defined Datacenter, and hyper-converged infrastructure | Containerized applications, container hosts, and application scenarios benefiting from faster innovation |
| New releases | Every 2–3 years | Every 6 months |
| Support | 5 years of mainstream support, plus 5 years of extended support | 18 months |
| Editions | All available Windows Server editions | Standard and Datacenter editions |
| Who can use | All customers through all channels | Software Assurance and cloud customers only |
| Installation options | Server Core and Server with Desktop Experience | Server Core for container host and image and Nano Server container image |
You can find the full article in this link
Shakir's Blog 