Either is sufficient. There is a movement to use the picometer, since it is a SI unit and gives you values in the tens or hundreds.
H = 0.37 Å, 0.037 nm or 37 pm
Na = 1.86 Å, 0.186 nm or 186 pm
As long as you indicate the measurement in the proper unit, people will understand it. Right now the Å is not being used that much since is not a SI unit, like the pm or the nm. The pm is becoming more popular.