No. Arabs enslaved more by numbers and over a longer period of time. What people also miss is that Arab nations attacked US ships and enslaved everyone on board. The US government paid them bribe money to keep them from enslaving our citizens. It did not work. Many white Americans were also slaves.

"Over 28 Million Africans have been enslaved in the
Muslim world during the past 14 centuries." ..... "While the European involvement in the
Transatlantic slave trade to the Americas lasted for
just over three centuries, the Arab involvement in
the slave trade has lasted fourteen centuries, and in
some parts of the Muslim world is still continuing to
this day. A comparison of the Muslim slave trade to
the American slave trade reveals some interesting
contrasts. " One of the great things about being a male Muslim owned slave is that you were immediately castrated.

"Between 1525 and 1866, in the entire history of the slave trade to the New World, according to the Trans-Atlantic Slave Trade Database, 12.5 million Africans were shipped to the New World. 10.7 million survived the dreaded Middle Passage, disembarking in North America, the Caribbean and South America." "And how many of these millions or Africans were shipped directly to North America? Only about 388,000. That’s right: a tiny percentage."

http://www.pbs.org/wnet/african-americans-many-rivers-to-cross/history/h...

"Muslims also enslaved Europeans. According to Robert Davis, between 1 million and 1.25 million Europeans were captured between the 16th and 19th centuries by Barbary corsairs, who were vassals of the Ottoman Empire, and sold as slaves.[22][23][24] These slaves were captured mainly from seaside villages from Italy, Spain, Portugal, Ireland, and also from more distant places like France or England, the Netherlands, and even Iceland. They were also taken from ships stopped by the pirates.[25]"

The effects of these attacks were devastating: France, England, and Spain each lost thousands of ships. Long stretches of the Spanish and Italian coasts were almost completely abandoned by their inhabitants, because of frequent pirate attacks. Pirate raids discouraged settlement along the coast until the 19th century.[26][27]
https://en.wikipedia.org/wiki/Arab_slave_trade

Some more about America and the Arabs
http://gwpapers.virginia.edu/history/topics/gw-and-the-barbary-coast-pir...

What's the point of this comparison? Turning people into commodities, livestock, and machines is immoral, whether you do it to millions for centuries or to one person for a day.

No nation or ethnicity is innocent. At one time or another we've all profited from the chains.

We look back smugly on these awful histories of slavery as if we had finally succeeded in eliminating this evil from our world. The tragic fact is that millions of people are enslaved right now.

http://www.ilo.org/global/topics/forced-labour/lang--en/index.htm