Points total represents what you have done over 38 games - your league finish pits what you done against the other 19 teams, one is in your control, the other is not...
If at the beginning of the season you're given a chance to pick your points total, you'll choose the highest available and hope the other sides didn't do as well - well that season we statistically had OUR best run of 38 games since the leagues inception, unfortunately 4 teams done better.
Finishing highest in the table is obviously the bigger acheivment, which i've yet to see anyone disagree on, but lets not write off our best ever points tally as though it's not a sign of a good season.
It's like a 100m runner, he uses his personal best as the benchmark everytime he runs, he doesn't aim for the time he won his last race in...