Recommendations I've come across somewhere suggest an optimal UTXO size of 1,000,000 sats. This figure seems to be  consistent with the  current Bitcoin distribution.




Large-sized UTXOs add threat  to privacy   due to 1) keen interest in addresses that hold them 2) the substantial  size of  possible change if such UTXOs are  in transactions.

On the other hand, too small UTXOs may result in increased transaction cost due to the fee needed to cover  the extra inputs