Prefer civil marriage (taxes go brrrr)?

Hey everyone, my girlfriend and I are considering getting married 1-2 years earlier than originally planned for tax reasons. We have to say here that spousal splitting is the main factor that motivates us to do this because of our following situation: She: earns €5,500 a year as a working student, currently on family insurance through her parents. This will continue for about 2-3 years before she starts full time. Me: I earn 50k in my job and again as a self-employed person