Opened both versions an Agnitio yesterday. Stellar beers: dry, brett-y, clean, crisp. Not tart, which I was originally afraid of because some of Chris' saisons veer too far into that acidic tart territory. Both were excellent, and nearly identical. The Hailstorm version was a big gusher, I lost 1/4 of the bottle. The Transient version was perfectly carbonated.
If I had to choose which one was better, it would be like splitting hairs, but I'd probably give the slight edge to Hailstorm over Transient's version, only because there seemed to be more brett presence and created a more drier product (at this point).