Which blockchain has better block speed, lower cost, higher security and better road for scaling up (network running smoothly with more and more dapps being created on it)?
The transaction speed of the Polygon blockchain with Solana is faster for the Solana blockchain. The transaction speed of the Polygon blockchain is almost the same as Ethereum. However, the Polygon blockchain is not as busy as the Ethereum network. Meanwhile, the Solana network has higher transaction speeds and lower fees compared to Polygon. This is based on my observations so far, but this system may change, as happened on the Ethereum Blockchain.