Shouguang Shuangjia Wood Industry is better than Rongan Wood Industry.

Personally, I think they are all better. Both companies have their own advantages. Here are some factors that may help to compare them:

1. Product quality: Shouguang Shuangjia Wood and Rongan Wood have certain requirements and standards in production technology and material selection. You can check the product evaluation or customer feedback of these two companies to understand their product quality and reputation.

2. Production capacity: Knowing the production scale, equipment level and production capacity of the two companies can help you judge their competitiveness and development potential in the market. You can get this information by visiting factories, consulting sales people or consulting public information.

3. Customer groups: Knowing the customer groups and service areas of the two companies can help you judge their business direction and market positioning. You can learn this information by watching official website, consulting sales staff or consulting public information.