If you fly, you will need to take the 9:00 flight from Schipol to Luxembourg, so you would need to take a 6:40 train from Amsterdam Centraal to Schipol arriving 7:00. The flight arrives Luxembourg airport at 9:55, and you might be able to make the 10:33 train to Trier, arriving at 11:24. That train has a Flexpreis of 38.80 EUR for 2, and the flight looks like 280 EUR for 2, and the train to Schipol is about 10 EUR for 2. If you miss it, the next one is in 1 hour.
There is a single connection train leaving Amsterdam Centraal at about the same time of 6:37, connecting at Cologne to a train to Trier (not the normal route along the Rhine, but through Gerolstein) that arrives at 12:27, 1 hour later than going by air. Cost if bought well in advance is 70 EUR for 2.
So there you have it. Spend 70 EUR, or spend 329 EUR and get there 1 hour sooner (maybe).