Stick lengths

HI guys it's me again.
I'm just wondering which stick size I should get, 36.5 or 37.5 for my new stick.
I'm about 165 cm tall, on theory I should get a 36.5.
But after trying both 36.5 and the 37.5, the 37.5 seems better for me.
And I thought that I have been using 37.5's 2 years before till now (school sticks).
So am I used to 37.5's, making me comfortable with 37.5's, or the practice of me using 37.5's most of the time is not healthy, and that I should use a 36.5?

Thanks a lot!