How are you pronouncing
Ludwig. If you're saying LUD-wig, I'd definitely have to go with the other combo. LUD-wig sounds so clompy and awkward to me. LOOD-vik on the other hand is far more appealing to me.
Ludovic, however, is my favorite of the two, and I think it goes very nicely with
Caspar (which is so fun and refreshing).