If you want the tantrums to stop, never ignore. If they are just starting it is the perfect opportunity to nip them easily with firm discipline after a calm warning. Soon you will only need the warning. I have 3 non tantrummers because they have never gotten away with a tantrum by being ignored. This book is great on what to use when (depending on setting) if you want fits to stop: Back to Basics Dsicipline by Janet Campbell Matson. Ignoring is fine, as long as you understand that doing so is the decision to live with fits.
My third started raging deliberate fits at 9 months. She took more diligence than other two, but she just turned 2 and she's a sweet non tantrummer since age 15 months.
You're asking what's appropriate in dealing with fits, for you or your child? If you feel fits are appropriate: ignore. If not, doing what works is appropriate.