There is no real contest to referee here - the Podium DD1 is a 20 Nm flagship, the R5 a 5.5 Nm complete bundle at a quarter of the price. One is for someone building a high-torque cockpit; the other for someone taking a first, affordable step with everything in the box.
So buy on where you are. If you want flagship torque and the Fanatec ecosystem, the Podium DD1 delivers. If you are starting out and want a full setup for $399, the R5 is the answer - and its upgrade ladder lets you climb later.