Martell XO - has more sweetness than RM
Hennessy XO - very very smooth
HINE Antique - very smooth with a nice aroma
SCOTT XO - not as smooth as the others above, but has a nice taste at a very bargain price compared to other XOs.
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I have yet to try Louis XIII at $900 a bottle or
Hennessy "Paradis" at $200.
If you try them, please let us know of your opinion.