It never hurts to try things out and experiment, but in general, Custom Instructions are great for a few small changes. The more substantial the change the more likely it is that a Custom Template is the better option. If in doubt, contact [email protected] and we'd be happy to help!
Are there any advantages to using Custom Instructions over Custom Templates?
Yes! Not only are personalizations easier and faster to create, but they also benefit from the fact that we constantly update and improve our standard templates. As a result, with the Personalization option you'll be able to maintain your customization while the underlying template improves over time in the background