There's no difference for you. It's your code. Choosing a particular license can't restrict how you yourself use it. An absurdly common business model is for you to relicense to BSD/MIT/proprietary for a particular customer who pays you to; it's the same code, you're just not obligating that customer to share their changes if they redistribute it.
The GPL is a statement you're making about the rights that other people are granted when it comes to your code. It's not a personal pledge. Exactly like every other license btw; they aren't oaths. You're also not required to police or sue people who break your license. It's your code.
The GPL is a statement you're making about the rights that other people are granted when it comes to your code. It's not a personal pledge. Exactly like every other license btw; they aren't oaths. You're also not required to police or sue people who break your license. It's your code.