There is no easy answer to this. It depends how often you fly, and in which booking classes.
LH Senator is obviously more valuable than TK*G - when flying LH group.
As I understand LH is now running a status match program for EB members.
Even if you receive SEN through status match, it requires quite some flying in higher booking classes to renew LH Sen.
For this reason I signed up for TK and is now working on my status with them. They are running a status match campaign as well.
I’m ditching Eurobonus altogether as I have status with flying blue these days as well.