The 258 bracers are essentially better. Resto druid stat weights routinely put crit at worse than 20:1 to SP, and the value of int is derived in huge part by the mana regen component of it, which there's a virtual consensus among top-end druids to not be a big concern; most stat weights still MP5:SP at 1:0.9 which is wrong, wrong wrong at the very front edge of progression.
Even if you want to say they're vanishingly close (which 90% of BiS upgrades are), the key to building a BiS gearset is to be consistent about picking up these niggly minor upgrades. Then, realize that in practice it's going to be difficult to collect all of this gear and start looking for the best compromise you can manage.