I like and use their 10x30Wt VR1. I would buy and use 5x20Wt if they offer it
I stop using 20x50Wt a lot of years ago after doing multiple back to back engine dyno pulls with many different weights of oil, 5x20 WT showed no gain in HP increase form 80F to 220F oil temps, straight 30 Wt. showed a little over 8 HP gain going from 130F to 170 F, 10X30 WT gained 3 HP from 130 to 160 F
I didn't try 20x50 Wt. due to having seen similar tests that showed over 10 HP gain from 120 F to 170F.
Oil does two things in our motors, it lubes and cools, I see oil pressure with a cold motor a lot sooner with 5x20WT compared to 20X50Wt, a lot sooner.
Do you like oil pressure sooner than later, especially on start up