Blue zones are supports for where you should convert UNI to SUSHI. Currently, the pair favours UNI as SUSHI is currently having a correction.
Fundamentally, SUSHI has been growing much quicker and has been increasing in total value locked relative to UNI, where it's total value locked has decreased significantly from Summer 2020.
I personally expect SUSHI to continue to correct relative to UNI, until either support shown below, where SUSHI will start a new impulsive leg up.