This confuses me a bit.
A CS is a major abdominal surgery. It takes a LONG recovery time, has many risks to both you and baby, during and after the operation, and can have follow on effects for you and bubs in terms of feeding success and health complications.
Tubal Ligation is a keyhole surgery, with very minimal invasive characteristics, is a day surgery, with short recovery time and comparatively miniscule risk to you and NO risk to your baby (obviously).
So why would you opt for a non-medically indicated MAJOR surgery for the purpose of saving yourself a MINOR procedure?

Is there some other reason you are contemplating a cs? I've had one - I wouldn't choose it without a real reason, and not sure there would be a benefit to choosing it simply to have your tubes done.