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I would have used the 1st Weltall for the fact that it can directly transform into ID-Mode But Weltall-2 seems more comparable to Omega Universitas. Weltall-2 can use system Id that draws out Id's powers without transforming to Id and omega Universitas can transform into Omega-Id, which is the xenosaga version of the Id transformation. If there was a contest between the two, who would win? Fei or Abel?

Weltall-2 wins. Weltall Id busted a country. And Weltall-2 has the same specs. Omega Id is a system which reacts to thoughts and hasn't been confirmed to be Xenosaga's version of Id, nor is Abel confirmed as the pilot of Omega Universitas.