The advantage for a sorcerer of taking 1 level of wizard is limited and based mainly on supplementing the sorcerer’s very limited number of known spells with a handful of spells that don’t rely on casting stat (e.g., haste, misty step). Damage dealing spells would still need to be taken from sorcerer list to be effective. Trading one feat and a 1-level delay in access to key spells (eg, lightning bolt, chain lightning) would probably be worth it, but I’d need to do the math. I dislike playing sorcerers in PnP because one needs to map out spell progression in excruciating detail at the start of play, and taking a level of wizard would complicate things.
Taking 1 level of wizard on a tempest cleric instead could be a very powerful combination but would rely heavily on getting a good DC for intelligence since lightning spells would need to come from scrolls.
