Looking for reviews on sizing of the Wunder Train compared to Align leggings.

I’m getting back into the gym and I know Align can’t stand up to training. I use them for Yoga and I’d like to not totally ruin them in the gym!

How do we find the WT? Size up or down? I’m curvy and contemplating my true size (according to measurement chart) 18 but in Align in can wear 16.

TIA!