# Which way of using parentheses looks better?

I feel like the parentheses look strange here:

$$uv=4\left(\frac{a}{2}\right)^2\left(\frac{b}{2}\right)^2= 4\left(\frac{s}{2}\right)^2\left(\frac{t}{2}\right)^2$$

Do people think they should have the same heights or be like this?

$$uv=4\biggl(\frac{a}{2}\biggr)^2\biggl(\frac{b}{2}\biggr)^2=4\biggl(\frac{s}{2}\biggr)^2\biggl(\frac{t}{2}\biggr)^2$$