In CA, the choice of court is mainly about two things: 1) The amount of money at stake, and 2) Whether you're asking the court to do anything other than award money.
Small Claims: $10K or less ($5K if plaintiff is a business), only asking for money.
Limited Civil: $25K or less, only asking for money.
Unlimited Civil: More than $25K AND/OR asking for something other than money.
As an individual suing a company you absolutely would NOT want to file in Limited Civil if you had the option of filing in Small Claims, among other reasons because in Limited Civil the company you're suing can be represented by a lawyer and the filing fees are considerably more expensive.
Small Claims: $10K or less ($5K if plaintiff is a business), only asking for money.
Limited Civil: $25K or less, only asking for money.
Unlimited Civil: More than $25K AND/OR asking for something other than money.
As an individual suing a company you absolutely would NOT want to file in Limited Civil if you had the option of filing in Small Claims, among other reasons because in Limited Civil the company you're suing can be represented by a lawyer and the filing fees are considerably more expensive.