There's no longer any difference, as mentioned in the comments section here: https://nblumhardt.com/2024/04/serilog-net8-0-minimal/#comment-6496448401

and in the source code here: https://github.com/serilog/serilog-extensions-hosting/blob/dev/src/Serilog.Extensions.Hosting/SerilogHostBuilderExtensions.cs

@Nicholas Blumhardt what is the difference builder.Services.AddSerilog(); and builder.Host.UseSerilog()?

Nicholas Blumhardt: There's no longer any difference between these; the Services option is the more recent one, and the Host one just forwards to it.