On the steps, I'd use a spar varnish with non skid grit sprinkled on between coats.
on thee sole itself, I'd oil
Once had a highly varnished sole- popped down to check a chart, with wet feet and found myself flat on my back ,staring at the overhead, while the boat merrily sailed along under autopilot.
Next day I stripped the varnish and oiled the sole.