One huge difference I see between these exchanges is the volume with no gaps and more coin setups. Here are the choices:

Kraken:  ['KAVAUSD', 'MANAUSD']

Coinbase: ['EOSUSD', 'ETHUSD', 'LTCUSD', 'MANAUSD', 'MKRUSD', 'SHIBUSD', 'XLMUSD']

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https://quantlabs.net/blog/2021/09/latest-trading-setups-for-coinbase-and-kraken/