I would take Byram over Podkolzin for a litany of reasons. Though Podkolzin has the upside to be a special player, there are those to think he will remain in Russia to develop for two to three more seasons. Also, if Podkolzin has one area to improve upon it's his skating, which is decent but far from a plus tool. Shero and Castron have shown a proclivity to draft with speed and tempo at the forefront of their wish-list. Lastly, and I know the "best available player" is a huge debate, but Podkolzin is a left-shooting winger, something the Devils are rich with organizationally. What the Devils really need to stock up on is pretty much everything else: defensemen, centers, right-shooting forwards.
Though Kakko is also a left-shooting winger, he would be impossible to pass up at #2 for the reasons that 1)he would make a considerable impact on the Devils next season and 2)he's a full talent tier above the player destined to be drafted at #3 overall.
I am extremely high on Bowen Byram. He is an outstanding skater, he's smart, he's competitive. He has the potential to be an absolute offensive force from the blueline, but he is much further along the development curve defensively than most offensive defensemen. Some of the other offensive defensemen that are high on some draft lists can be considered complete liabilities in their own zone (Broberg, Honka) while Byram is a physical, shut-down beast. Byram has no red flag, no liability whatsoever. His improvement curve over the 2018-19 season has been astounding, and he started the year as one of the top D in the WHL.
The idea of getting 20+ minutes per night at the ever-important LD position from Byram and Ty Smith a few years down the road is just tantalizing. Of course I would love to win a 1/2 slot and walk away from the draft with Hughes or Kakko, but if not I would say that Byram would be my choice.