I am looking to book a train from Hamburg to Groningen, and note that this can be done on either bahn.de or http://www.nshispeed.nl/en. From what I can see, when paying by credit card nhispeed charges a fee (2.5 euros) so it is slightly cheaper to book on bahn.de.
However, on bahn.de, online printable tickets are not available and they must be mailed to you. On the other hand, on nhispeed.nl, tickets can be printed from pdf. Is this correct, or will nhispeed also require tickets be mailed out?
Any advice (on the difference between booking with those train providers in general!) is much appreciated :)