What is the best option?
Partnership gives you support but slows down the flexibility and gives inertia.
Some characters are best suited for going solo. The best way is to try both by taking small steps.
If you are unsure, start looking for a partner and see in what conditions you would partner. Be specific, realistic. Partnering with someone who shows complimentary skills is a good option as well.
Take care of the concept side, your partner develops the marketing, etc.
Develop a flexible plan where partners see their freedom and benefits increased rather than the other way round. If benefits are unclear, drop it until you know it is truly for the best.