6 or 7 Stars - For an early/mid game player

Mannersmm

I just got to thronebreaker and I’m considering getting an Odin vault just to help out my progression.

The Odin vault for throne breaker gives me 1 7 star and a 2-3 rank up gem.

The Odin vault for cavalier gives me a choice of a previous 6 star. And 3 abyss nexus selectors for 6*s.

So my question is, should I take the gamble on 1 7 star which can be hit or miss. Or do I go for the guaranteed good set of 6 star champions to help me get through act 7 8 and 9.