The only real consideration here is which materials you want to use fortune-smelt on and which you want to silk touch instead. The same Enderium head+spam modifiers goes for all standard tools. In the end it doesn't matter much if you stick a capacitor on it though, as you can't reach a better tier either way. I believe you can get slightly better durability (and less annoying crafting imo) by using a Thaumium tool rod, and save materials by using a paper binding as the stats don't matter.
+ Redstone x 150 (15 Blocks of Redstone and 15 Redstone Dusts) + Diamond
TIP: Repairs your tools so they won't ever broke. + Lava Crystal (When You mine a block it gets Auto-Smelted) + Luck x 450 (45 Blocks of Lapis Lazuli and 45 Lapis Lazuli) + Redstone x 50 (5 Blocks of Redstone and 5 Redstone Dusts)
* Diamond Block + Notch Apples (Enchanted Golden Apple) + Redstone x 400 (20 Blocks of Redstone and 20 Redstone Dusts) TIP: if you use a source of power like a Restone Fux Capacitor to power your Items, you will have pretty much unbreakable pickaxe. + Leadstone or Hardened Flux Capacitor (Makes your pickaxe to require Energy)
