In any case, Texan Mids are major ingredient for making the Yard a great place! Go Navy! Go Rangers! Get 'em next year!!
1985 has nailed it. Remember, generally Senators only have 1 (maybe 2) slots from their state. Each MOC has same ...but from districts. However, and she may know specifics, my guess is if one looked at scores and stats of collectives from MD, VA, FL, TX, CA (maybe), PA, and NY,year in and year out they'd be higher than most other states.
So ...while that does not mean much in terms of appointment dynamics and outcomes, it would be one way to point to those states as more competitive. Conversely, simply looking at numbers from each state, even those from taken from the national pool, would likely reveal little regarding this question. Simply, those with more population and applicants, would likely be more heavily represented.
One caveat: There have been key targeted cities for diversity candidates. While I've no idea if this will continue after this season, but this could skew this issue of "most competitive" very significantly and quickly. In other words, let's say 10 kids (a random #) are recruited out of NYC. Simply looking at state numbers might make NY look to be much more competitive as a state than it is.
In sum, the question needs more specific edifying before it could be answered, and then it could only really be answered by USNA hidden stats.