The key difference
Base and Arbitrum are both Ethereum-compatible scaling networks, but they are separate destinations with different liquidity, applications and route availability. The correct choice depends on where you need to use the asset.
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Ethereum to Base vs Ethereum to Arbitrum Bridge.
Compare the practical considerations when moving supported assets from Ethereum to Base or Arbitrum.
Where each approach fits
Compare the live amount received, fees and estimated timing for the exact token and amount. There is no permanent winner because route conditions change.
What to compare
Consider destination needs as well as transfer cost. If your application, liquidity venue or wallet activity is on Base, a slightly different quote may still be the better practical route.
Bottom line
Use the live Ethereum-to-Base or Ethereum-to-Arbitrum route to make the decision with current information rather than an old fee comparison.