Super alloys are not necessarily better than alloys. Some alloys are better than super alloys. Their main difference is that they work on different principles.
He learned this difference very recently, and it has improved his chances of successfully forging an armament. This is why he wants to learn more about forging.
As for his second reason for prioritizing the acquisition of knowledge about forging, it is that he is a little jealous of what Thor has achieved with the red golem.
He is jealous, but it is only a little. His jealousy is manageable because even with his little knowledge of forging, he can identify a lot of disadvantages about having a powerful puppet.
The glaring and most important disadvantage is that it is going to cost a lot of money to build such a powerful golem. The materials and the energy source alone will take a huge chunk from his life.
