Hal Jordan and Silver Surfer switch universe

Hal's ring is always charged

Surfer power cosmic is not interrupted in dc

who does better in their new universe

Surfer has to join the corp, Hal has to join cosmic team ups and become a herald of Galactus

how do you imagine the scenario to play out

bumperoo

Hal rebels against Galactus obviously.

Like what Thinkerbell says then WTF blast Galactus, big G absorbs and somehow gains courage to oppose destiny which then collapse 616 Universe. So yeah Hal ends up destroying Marvel.