7th level Sorcerer spells look more impressive than 8th level spells for Sorcerer.
Reverse Gravity,
Etherealness,
Fire Storm, and
Whirlwind are all flavorful, powerful, and offer some sort of capstone-feeling power to a 6/14 Sorcadin. Reverse Gravity especially shuts down mobs of melee-restricted enemies like hordes of soldiers, giants, most orcs, etc.
Sure, Wizards have more possible tricks and combinations but realistically speaking
- A Wizard Probably Only has 2 Ninth Level Spells Prepared
- Only 1 Slot for them
- Is Most Likely going to be Wish / Filler
- Probably Appreciates another High Level caster picking up other spells to complement them
- You are not always going to be in a party with a Wizard
- Having a teammate who can do cool things doesn't mean you can't do them
For a 6/14
If you take Bard levels early on you are delaying access to ASIs, Aura, Metamagic, and SP in some order. If you take them late you are losing SP, potentially 7th level spells (not slots but spells known), and your 14th level Sorcerer ability. For several subclasses, Sorcerer 14 is at-will flight. 2 Cantrips, 3 Skills, some Level 1 Spells are making me drop Auras or at-will Flight because...?