Utu Grip Vs Rigorous Grip +1

Hey everyone.

Have a debate on whether or not a fully augmented Rigorous Grip +1 would be better than the Utu Grip. I have an R15 Ukon, so I'd apply it to my build. Currently I use the Utu with a Lissome to TP in, then swap to Fotia for Ukkos. The thought would be to pair the Rigorous (19 str, 3 acc, and 40-45 attk) with a War Bead Neck +2 for TP and WS to make up the difference in accuracy. Although not too sure how much the 10% Dex mod on Utu would come into play.

Thoughts before I go to make that kind of investment?

Utu isn't replaced by any grips for any of the jobs that can use it. Dex modifier too good.