Is the pain from Rejuran really severe? I'm debating between that and Vitaran.

My skin texture is really bad, so I'm thinking of getting a skin booster. However, everyone says Rejuran is effective but painful enough to make you cry, so I'm hesitant to try it lol. I looked it up and heard Vitaran is much less painful; will there be a big difference in effectiveness? My skin is on the sensitive side, so if anyone has tried it, please share your honest reviews!