OK So anyone who is playing with the more recent editions of Tinkers Construct would know there is some odd math going on with handle durability and modifiers, so I have copied the stats into a spreadsheet with mining levels in colour. Black being stone, grey iron etc etc.
I admit, its a mess, so I have added this. It will not tell you attack damage or mining speed but needless to say they are even less accurate then what the density stats say; unless someone else can figure out why my fully bronze broadsword has an attack of 5.5 & durability of 694.
Either way I sorted it by final result.
Sponge looks tasty yeah? Of course there is a catch. It gains silk touch but does 0 damage so cannot be used for weapons. They have also gotten rid of the Obsidian alloy known as Alumite and given straight obsidian stats for a pickaxe head. It is the only one you can go to the nether and harvest nether ores with also, Steel & Bronze have both been nerfed to match.
With the introduction of purple slime islands has introduced a new alloy known as Knightslime; 1 iron, 1 purple slime ball & 4 seared stone will yield 1 knightslime ingot. Without additional mods (like botania for prismarine) this alloy currently has the highest damage stat of any overworld weapon; the mattock isn't friendly either.
But what about removing the head from the equation?
Resorted & done.