Playing just regular TiC (no ExtraTiC or Iguana), I typically just go all steel for my tools with obsidian binding. Lots of durability with an abundant material to repair with. Mining level high enough for cobalt and ardite, too. I don't typically get fancier than that with materials for my tools, although I will for weapons. Those typically get a manyullyn blade, cactus rod (doesn't seem too pleasant to hold!) and paper guard. I'll go all-out with the modifiers too. A little blaze powder, necrotic bone, lapis, and the rest quartz. Weapons are where I actually use all the modifier slots, whereas I never do more than one or two slots of redstone on tools.