Full Steam Ahead
Whichever way you’re going to do it, pick one, and start writing. Despite the heat writers generate when arguing over methods, if your results are good, no one cares how you got there. And if your results are bad, it was a learning experience.
You can always change from one method to the other, if it doesn’t suit you or even if it stops working for you.
It’s your method, and you can do it however you want. If the other side declares you a plotting/pantsing infidel, tell them I gave you dispensation.
We’re writers, anyway. The worst any of us would do is kill you in a story, and since we also routinely kill our best friends and fans, that’s almost a compliment.