What is the difference between these two?

[Super Sonic]

"The best is yet to come."

"The best has yet to come."

Thanks in advance

[Teia]

"The best is yet to come."

"The best has yet to come."

Thanks in advance

The best is yet to come- is expected to come; is about to come.
The best has yet to come-must come
"have/has to" is the equivalent for "must"

[2006]

"The best is yet to come."

"The best has yet to come."

Thanks in advance

I would only say "The best is yet to come." (Probably)(Hopefully) it will come sometimes in the future. "about to come" means 'will come very soon', and "The best is yet to come." doesn't mean the best will come very soon.