Notubes rims dilemma – got 3 odd ones

I’ve got an Arch, a Crest and a Flow in white. I’m building a 140/120 full-suss 29er. Should I use a Flow on the front and one of the others on the rear? I’ll be using a 2.4 tyre on the front and a narrower one on the rear.

Or should I just buy another Flow?

I use a Flow on the rear and an Arch on the front of my 29er hardtail.
I’m fairly heavy, so wanted a stronger rim on the back, where most of the weight is, and a lighter one on the front, where the suspension will absorb most of the shocks.