You should replace your motherboard when you want a significant upgrade for features, compatibility with new CPUs or performance or when it fails.
Motherboards can easily last 10 years or more if they are well maintained, so there's really no standard replacement interval for motherboards.
Although some people want to upgrade their CPU as well as motherboard every 4 years to 6 years to stay current, especially if their compatibility requirements change.
The number one motherboard in the world is ASUS motherboards, most particularly the Asus ROG Crosshair X870E Extreme motherboard.
Asus is often highlighted as being a market leader in motherboards and consistently delivers high quality and innovative motherboards with cutting edge technology.
Other leading manufacturers of motherboards are ASrock, MSI and Gigabyte motherboards.
These are all popular and respected brands of motherboards in the PC building communities.
ASRock, MSI and Gigabyte mother boards are very frequently mentioned as top brands of motherboards and Gigabyte and MSI motherboards are also often considered to be equals to ASUS motherboards and ASRock mother boards are also noted for their strong budget friendly options for motherboards.
Intel is also great for motherboards and while Intel is primarily a computer chip maker, Intel is also a major manufacturer of motherboards and they have a reputation for reliability especially in their CPU Mainboards.
The best motherboard for you will also depend on your specific application for the motherboard.
High end motherboards, such as from ASUS offer top tier performance and features for enthusiasts, and other brands of motherboards offer strong alternatives for different budgets and needs.