This is an easy one to reason about because the money is so close. Both sit on Fanatec's QR2 and share the rim catalogue, so your wheels do not care which you pick. What separates them is 5 Nm and a bit of polish: the Podium DD1 is the 20 Nm flagship with stronger software and ecosystem scores, the ClubSport DD+ the 15 Nm upper-mid base that launched the QR2 era. For $100 the DD1 gives you real flagship torque rather than upper-mid.
So I would only take the ClubSport DD+ if the $100 really counts or you are certain 15 Nm is all you will ever want - and even then the DD1's headroom is the kind of thing you grow into. For most buyers weighing these two, the Podium DD1 is the more complete flagship and the small premium is worth paying. Both keep you inside the Fanatec ecosystem, so nothing about the choice strands your rims later.