The burrito is good and as you said easy to make the night before for early starts. I find the veggie scramble is a true all-day fuel winner for me. It's a simple one-pan cookup with eggs, carrot, sweet potato, mushies, spinach and I add either bacon, salmon or chorizo to the mix for added fat plus protein/salt. A combo of the two recipes in a soft corn tortilla is awesome.
The main thing is get you body use to whatever you are going to do on the day or in the lead up, don't go changing it up a few days before or worse, on the day. If trying something new like diet changes from carb energy to fat based energy do it now to see if it works and get you body use to burning it.