Well there is undeniably different kinds of slavery. An alternate type is to castrate the slaves and prevent them from having children, or just working them to death. You can have your own judgement which type of slavery is worse.
They went even further than Ireland and made it all the way to Iceland
"Pirate raids for the acquisition of slaves occurred in towns and villages on the African Atlantic seaboard, as well as in Europe. Reports of Barbary raids and kidnappings of those in Italy, Spain, France, Portugal, England, Netherlands, Ireland, Scotland, Wales, and as far north as Iceland exist from between the 16th to the 19th centuries. It is estimated that between 1 million and 1.25 million Europeans were captured by pirates and sold as slaves in Tunis, Algiers and Tripoli during this time period. The slave trade in Europeans in other parts of the Mediterranean is not included in this estimation.[21]"
Well there is undeniably different kinds of slavery. An alternate type is to castrate the slaves and prevent them from having children, or just working them to death. You can have your own judgement which type of slavery is worse.
They went even further than Ireland and made it all the way to Iceland
"Pirate raids for the acquisition of slaves occurred in towns and villages on the African Atlantic seaboard, as well as in Europe. Reports of Barbary raids and kidnappings of those in Italy, Spain, France, Portugal, England, Netherlands, Ireland, Scotland, Wales, and as far north as Iceland exist from between the 16th to the 19th centuries. It is estimated that between 1 million and 1.25 million Europeans were captured by pirates and sold as slaves in Tunis, Algiers and Tripoli during this time period. The slave trade in Europeans in other parts of the Mediterranean is not included in this estimation.[21]"
https://en.wikipedia.org/wiki/Barbary_slave_trade