Warpiglet
Adventurer
I'm just not sure of the reason you would want to play a Fighter/Sorcerer over a Paladin?
We might ask why play paladin over fighter or wizard over warlock and get the same answer. Flavor. Everyone says the paladin is a gish of sorts. However I am more interested in fighter magic user of old today. Might want to play a righteous holy warrior another day.
The sorcerer can throw fire bolts, have a flaming sword, fly and cast blight. A paladin does more paladin stuff. If you mean one is better I would only ask what is the definition of better in D&D? For me it is similar to asking if
Vanilla or chocolate is better. They both flavor a food but that does not mean they are the same flavor!