Do I need to bind to servers of the same type when creating a cluster?

Question

Clustering

Good afternoon.
Tell a person who is ignorant of the subject. Are there any recommendations for Vendor lock (all servers from the same manufacturer) or Hardware Lock (all servers with the same CPU / RAM / HDD filling) servers when creating a cluster?

Answer 1

if your task is not to cut the budget, then you should avoid any locks to the maximum;
now everything is packed into virtual containers, so vendors are not of fundamental importance.

Answer 2

Buy the maximum level of support from the vendor, because any massive problem on their part can cause a complete failure.