i heard on the French side "i won't go to the Dutch side and pay 25% service charge". I only went to one Dutch side restaurant. The service charge was 15%. We left 8% tip. The service charge needs to go. Especially if the service is sub-par. Many places seem to have new staff.
On the French side there is a small tax. About 4%. Several servers mentioned to add tip before charging or leave cash. We tipped about 10%.
Dutch side seems to have a more price conscious customer. French side are willing to pay for perceived haute cuisine.
Restaurant in Miami airport had 18% tip on bill with a +/- line to raise or lower.