IF everything came out according to how FIFA seeded the draw the both sides would be pretty equal
Of course, Russia were seeded as host country when Uruguay would really be the Pot A team in that group. Well that has corrected itself so the draw is still balanced at the moment.
The highest that Argentina can finish is second, putting them into the top half of the draw potentially, when they should have been in the bottom half, so you could argue that makes going into the bottom half look more attractive, but would you really choose to put yourself in with Croatia.
As I say, the only time things look unbalanced is if Brazil or Germany finish second in their group, and the other one is a group winner. If Brazil are a group winner and Germany are second, then the top half of the draw looks very strong potentially. If Brazil finish second and Germany win, then the bottom half looks slightly nastier. Especially as it would mean that all the big guns (assuming France win their group) in the top half would all be playing each other in the same quarter.
The only other unbalancing factors left really are England potentially finishing above Belgium to go into the top half, and possibly Japan finishing in a qualification spot ahead of Poland on rankings. If Japan finish second then they go into the top half, weakening that quarter further. If they finish top and Colombia also win then Japan are in the bottom half and Colombia are in the top, which balances it back out a bit.
Like I keep saying, the key questions for draw strength are whether Argentina make it through and the outcomes of the Brazil and Germany groups.