Yes, take a bit of time with Antidote and it will become apparent that it adds flavors that Thor can't deliver. The two instruments feel rather different and this is a good addition.
The fact you get the FX chain included not only makes the synth more versatile but it gives you a new set of general fx for the rack.
I will call this as the first must-have pon-Propellerheads synth.
EDIT: here is a piece I made whilst trying Antidote. This version is 100% Antidote (even drums). The version that will go on the album (?) replaces the lead and bass with Thor, because the sounds have more punch and sit in the mix better but that is it.