When Vox was meta, he was OP in ARAL, and if he had his Legendary talent, he was even stronger. The meta is important in both situations, but in ARAM, thanks to being 5 players instead of 3, you are unlikely to find a match as unbalanced as in ARAL, and the fact that the lane is bigger, helps against long range poke mages, so overall is far more balanced than ARAL has ever been.