How are you rating these because it seems to make no sense?
2019 has a League One side in the League Cup semis, I doubt we'll be seeing that in the FA Cup, so without even seeing the draw I'll say FA Cup.
2018 had a Championship side there, while the FA Cup had four Premier League sides. FA Cup.
2017 had a Hull side that were relegated that season, and Southampton, while the FA Cup had four teams from the top 6. FA Cup.
2016 was an all Premier League affair for both competitions, slightly edged by the League Cup.
2015 was three Premier League sides in each, except a League One side played in the League Cup, and a Championship side in the FA Cup, so the FA Cup just edges it.
2014 was League Cup quite easily.
2013 was FA Cup easily, by virtue of a League Two side not being there.
2012 was FA Cup too, because it as all Premier League while the League Cup had an all Championship tie.
That makes it six FA Cups stronger in the last eight years, and I'd wager that number just increases the further back you go. You weirdly had 2018 as equal, despite there being a Championship side in the League Cup, then said 2017 was FA Cup by far when it as all Premier League in both sets.