The best mining machines or graphics cards for mining Bitcoin will depend on several factors, including the current mining difficulty, the cost of electricity, and the current price of Bitcoin.

Currently, the most efficient and powerful mining machines on the market are the ASIC (Application-Specific Integrated Circuit) miners. These specialized machines are specifically designed for mining Bitcoin and are much more efficient than general-purpose computers or graphics cards. Some popular models of ASIC miners include the Antminer S19, the Antminer S19 Pro, and the Bitmain S17.

In terms of graphics cards, the most powerful options for mining Bitcoin are the Nvidia GeForce RTX 30 series, which are built with the latest technology and offer high computational performance. They are also energy-efficient and generate less heat, which is important in a mining rig.

It's important to note that the mining difficulty and the price of Bitcoin are constantly changing, so what may be the best mining machine or graphics card today may not be the best option in the future. Additionally, it's worth considering the cost of electricity, as mining Bitcoin requires a significant amount of power, which can significantly increase the overall cost of mining.

As for the Masternodes, it's a different type of mechanism of participation in the network, and it requires a different set of requirements, such as a dedicated server and a certain amount of cryptocurrency to be locked as collateral. It's also important to mention that Masternode is not a way to mine cryptocurrency but a way to participate in the network and earn rewards.

In conclusion, it's recommended to research the current market conditions, the costs, and the benefits of each option before making a decision, and to have a clear understanding of the long-term prospects of the mining or running masternodes.