B&H will give you a price quote in 24 hours which will give you an idea of what they will offer:
Used Quotes
But if you want "top dollar" for your equipment, selling privately is always going to get you more because any pawn shop or camera store may need to invest time and resources to inspect and clean used equipment. They are also in business to make a profit.
As your cameras and lenses are more expensive in Europe, you'd get more selling it in the Netherlands or the EU...not to mention the USD exchange rate. With that said, the huge advantage of B&H or Adorama or shareasale.com/r.cfm?b=889257&u=523490&m=66875&urllink=keh.com is convenience. KEH will also give you a quote:
https://www.keh.com/sell/
Good luck. And definitely enjoy the awesome camera store in NYC.