Long pips ox or sandwich?

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I have no intention to switch to long pips, but asking for my team member. :)

He is using Tibhar Grass long pips with 0.5mm sandwich. Plays close the table, has a strong FH and uses his backhand (close to the table) to disrupt the rally. He does not attack with his pips.
Question: Would he benefit from switching to OX for his playing style? What is actually the benefit of using OX compared to (already thin) sponge?