Best time to go in Spring 2020?
"Wanting to go to Disney in February or March 2020. What would be the best week?"
February over March
While I haven't done the 2020 crowd calendars yet, I can pretty much say avoid March. It will be really busy after the first few days of the month. As You can see in the 2019 crowd calendar the typical crowd pattern for February shows light to moderate crowds except for Presidents Day week.
March is a whole other story. It's busy all month. Spring break crowds usually start showing up around the 10th and from there it stays busy until Easter week.
As you can see typically February is a lot less busy. I think any week in February except for Presidents Day Week will be fine. I like early February.
Dad's Bottom Line
I would probably choose the first week in February. You will really want to avoid President's Day Week and March, yes all of March.