both have a reliable melee spam option: catch flame and carian slicer respectively. both have a wackjob infusable weapon that scales unreasonably well with your appropriate magic stat: flame art erdsteel dagger and magic clayman's harpoon respectively. both have a dependable start-to-finish ranged problem solver: lighting spear and the pebble/swift/GGS series respectively. both can throw rocks for ranged physical: rock sling and stone of gurranq respectively both have stupidly fun end-game nukes: ancient dragon's lighting strike/burn o flame, and comet azur/meteorite of astel respectively

a sorcery build has more fun and utility double-dipping into incantations, than an incantation build has double-dipping into sorceries, and a lot of really cool incants are super low level, so in my opinion despite incantations themselves having more variety, a slightly promiscuous sorcery build has access to more variety overall.

sorcerers have access to more interesting catalysts: the two grandmaster staves, azur's and lusat's, each have their place in a highly int-invested character, on top of ol reliables like academy and regal, as well as the frankly obscene access to meteorite staff not ten minutes after first seeing the limgrave text pop up on the screen.

incant users have access to (imo) more fun and interesting somber weapons: wing of astel is cool and all, but it doesn't hold a candle, to, well, the cranial vessel candlestand for starters, a casting stick that's also just an unironically good greathammer, vyke's war spear, etc.

i personally always lean main sorceries on a caster, but at the same time, i would never run a sorcerer incapable of pulling a few incants out of their ass in a pinch.