Aluminium ladders for me, a decent set will last you many years, and they are not likely to snap either, I've been working off them for 33 years and I've never known that happen.
Don't bother with ultra light cheapo's, always buy good quality light trade ladders.
I'd generally go for Aluminium pointer ladders too, they last longer and are just that bit quicker to throw around.
On uneven ground, whether wooden or aluminium it makes little difference, you will always be able to ensure three points of contact.
The black hands are from aluminium oxide, you will always get it once the anodized surface wears off...thats if they are even anodized to begin with!
As for feet, well on my one set of Aluminium pointers I had those feet attached that look like hinged suction cups, absolutely fantastic adhesion to any surface, and no sinking into lawns or gardens.
Ian