To compare the trading volume between the two liquidity pairs USDC-WETH and WBTC-WETH, I have made sure that we are comparing using the common currency which is WETH. So all volumes displayed in the above are using token1In (WETH in) and token1Out (WETH out) data. It is clear that the the WBTC-WETH pool has less swap volume as compared to the USDC-WETH pool. This is because:

1. Number of Swap transactions are a factor of 10 higher in the USDC-WETH pool than the WBTC-WETH pool.
2. WETH volume in and out per day is higher by over a factor of 5 in the USDC-WETH compared to the WBTC-WETH.