It's best/better like this.
It's for the best/better.
Are all options grammatically correct?
The common expressions would be: It's better like this. ) It's for the best. ) Better compares two.
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The common expressions would be:
It's better like this. (A comparison of two states--the current situation is better than the alternative.)
It's for the best. (This state is the best of all possible states.)
Better compares two. Best picks one above several.
Clear?