the intercity is cheaper no need to book in advance. just buy your ticket and go. the thalys is like an airline. a spur of the moment ticket can be expensive as compared to booking well in advance.
If your trip is imminent, just buy a ticket for the normal Intercity train to Amsterdam; there is a hourly service from Antwerp and the journey time is not significantly greater than on the Thalys. The Thalys is also more expensive and requires booking seats in advance; with the Intercity, there is no advance booking; just buy your ticket at the station before departure then go.
IC train is always € 59,20 return (unless you get a cheap day return). Thalys starts from €50 return, less if you get a special offer but you would have to book well in advance and comit to a certain train to get that fare.
Thalys is more comfortable and you are guaranteed a seat as reservations are compulsory. It also take only 1hr12m compared to 2 hrs 7mins for the IC.
You can also take a look at the Eurolines bus service which can be much cheaper but takes longer. It's time and convenience against cost.
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