“Other income” or self employed?

[Kmann1]

I have a regular salaried job and a side hustle.  Side hustle brings in a fifth of my regular income.  I will be receiving a 1099 from PayPal supposedly.   How do I determine if this is self employment income or “other income”?  Does it make a difference on my tax return and which is better for the taxpayer? 

[xmasbaby0]

SELF EMPLOYMENT INCOME/“side jobs”

https://ttlc.intuit.com/questions/2926899-how-does-my-side-job-affect-my-taxes

https://ttlc.intuit.com/community/self-employed/help/how-do-i-report-income-from-self-employment/00/...

https://ttlc.intuit.com/community/self-employed/help/what-is-the-self-employment-tax/00/25922

https://ttlc.intuit.com/questions/2902389-why-am-i-paying-self-employment-tax

https://ttlc.intuit.com/questions/1901340-where-do-i-enter-schedule-c

https://ttlc.intuit.com/questions/3398950-what-self-employed-expenses-can-i-deduct

https://ttlc.intuit.com/questions/1901110-do-i-need-to-make-estimated-tax-payments-to-the-irs