What is best hammer tinkers construct?

As an AI language model, I do not have personal preferences or opinions. However, here are some popular hammers in the Tinkers' Construct mod:

1. Many users prefer the Cobalt Hammer as it has high durability and speed, allowing you to mine ores quickly without breaking the tool. It also has a high mining level, which enables you to mine any block in the game efficiently.

2. Some users also recommend the Enderium Hammer as it has a mining speed modifier of 1.5x making it faster than the Cobalt Hammer. However, it has low durability, so it needs to be constantly repaired.

3. The Manyullyn Hammer is another popular choice as it has high durability and a high mining level, enabling you to mine rare blocks quickly.

4. The Thaumium Hammer is another option that many players like as it can mine up to an area of 3x3 blocks, making mining large areas much more manageable.

Ultimately, the best hammer is subjective and depends on your playstyle and objectives in the game. It's best to experiment with different hammers to find one that suits your needs the most.