Re: Best boat to sail around the world ?
You have two issues buying and doing. Even if someone provided you with an answer or it were possible you would still be well advised to study the issues involved in choosing. Repairs and upgrading are likely to be significant costs.
Then on a practical basis it depends rather on what is available at the time.
Before buying it would be a good idea to read up on the subject including the considerable amount on the internet. Doing so is a good pre-qualifier.