Hello aspirant,
I am here for helping you.
You were asking that which ranking is good from 'AAA+' and  'AAAA' so both ranking seem same on first glance but these are not same here 'AAAA' ranking is better than 'AAA+' ranking and another ranking which is more powerful than 'AAAA' ranking is  'AAAA+' ranking, this is actually a simple concept  as A+ is good ranking than A as same in the queue of AAAA rating AAAA+ is good ranking than AAAA and in queue of AAA rating AAA+ is best than AAA rating
and AAAA is good than AAA due to having one more A so same it also powerful than AAA+.
i hope it will help you.
For more queries you can upvote me and can ask in the comment box.
Best of luck.

AAAA is better than AAA+
AAAAA being the highest is exceptional with 95-99 percentile rating of college
AAAA+ IS 90-84 percentile
Then AAAA is 80-89 percentile being very good.
And AAA+ is 70-79 percentile being a good college.
Hope it helps!