I would say probably not. I think a tie is the worst outcome, and here is why:
We are VERY strong in divisional tie-breakers, not just because of head-to-head wins against both teams and our 2-0 mark in the NFC West, but also because we are 0-2 in the only two NON-common opponents (DET/CRL) thus guaranteeing a BETTER common games record versus Seattle (who already beat MIN and ATL) and at worst a draw with San Francisco (hasn’t yet played GBP or NOS) should we finish with the same overall record.
In divisional tie-breakers, it goes head-to-head, then divisional record, then common games, then conference record. The silver lining in losing to Detroit and Carolina is that those two games count the least of our 16 games when it comes to divisional tie-breakers It’s a different story in playoff tie-breakers versus teams from the other divisions, where conference record does come before common games.
A tie in the Seattle-San Francisco game would make it very unlikely that we could use our tie-breaker edge against them, unless we tie a game, or each of them tie another game. Essentially a tie for them is like a win for them in how it relates to the Cardinals, as long as we hold a tie-breaker edge.
As to for whom to root, I guess it depends on our goals. A Seattle loss helps our case for the division. A San Francisco loss thins out the wild card race. Too early to know what might be the better call right now. I prefer a 49ers win, but it’s not a clear-cut call.
