Ditto what DemostiX said bout JRB.
I know nothing about the Vertex tarps, they may be the better choice for all I know. But when comparing the RL lengths ( of 11 vs 10'7"? ), be sure to find out if both are rectangular cut, as is the JRB. For a given length RL, the rectangle will give you more end coverage than the hex, and will be a little easier to close "doors" on, and will be easier to use in a wider variety of pitches like Baker Huts and pitching on the short ridge for a "hammock hut" etc. Then again, all other things equal, it will weigh more. so as always, trade offs.
I think my wonderful Mac Cat Dlx Hex had the same 11 ft RL as my JRB, but I had significantly better coverage of my JRB Bridge with the JRB tarp. Then again, I think the JRB weighed about 5 or 6 oz more, so there are your choices!