according to the official write up it says
Question - Should I do pullups or chinups?
Doesn't matter, really. Use whatever you're strongest at. The delineation between chinup and pullup is overemphasized in importance. Most newbs will be strongest with a grip that is parallel (i.e. hammer grip), with a hand spacing just closer than shoulder width.
Whatever you do, pick one and stick with it and add weight once you can hit 10/12ish reps in a set. Go hard on these, don't be afraid to use a little kick on your last rep, and have fun.
Question - What kind of grip should I use on these?
Doesn't matter. Don't obsess over whether you should do "chinups" or "pullups" or "behind the necks" or "wide grip front" or "medium grip" blahblahblah
just pick a grip and get better at it in a progressive manner. No, chinups aren't cheating. No, chinups aren't all biceps (can you REALLY curl your entire bodyweight?) Do whichever hand space variation allows you to work hardest and get the most reps with.
do you agree? or no?