Out of the two, the Sting looks the best. The Symtex cover was the same cover that was used on the Scandal series, which was the best symmetrical HP balls I've used. The LED core is already proven: Original Scorpion, Purple Pearl Urethane, etc. Predictable with predictable, so that makes a great midrange product.
Is this coming in to replace the Web series, or the Raw series?
As for the Envy Solid... ugh. It's going to need oil like the Obsession Solid, which if there isn't any, it's going to burn up and puke.
BL.