You say 'we' so I assume you're going to have company aboard most of the time.
The motor is realistically too small for an SR4 on the Cornish coast with 2 people aboard.
The Humber would be a better bet of the two if I was pushed to say it as there's not a lot of room for 2 people onboard an SR4 console either.
However, the SR4 would be my choice with a bigger engine if it was going to be mostly solo use
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