I reckon the better a paving surface looks, the slipperier it is, particularly in the wet.
Asphalt: ugly, but grips well, even in the wet.
Tiles (as platforms at Flinders Street station have been converted to, but thankfully not ramps) and blue-stone (increasingly common on CBD streets) look nicer, but are more slippery.
And some types of tactiles (bumps, for the vision-impaired) often aren’t that great in terms of grip either.
Agree? Disagree? Is it my shoes?