Hi there

I'm not sure I understand your question on "which one is a better option"... obviously the cheapest one for you - if we're talking about the same product.

On a different note, the cheapest way to travel between AMS and PAR is not to take Thalys, but the regular international train. It might take a bit (but not much) longer and you may have to change in Brussels (though not always) and it's much cheaper. I am not sure you can book it online but you can certainly see the connections etc on www.ns.nl or www.bahn.de