Ti-springs' best ti spring is plastic coated, so who knows. Steel shaft > kashima because it can be thinner without losing strength, thinner diameter stanchion/shaft = less stiction. That's why fox 40s are dumb, stiction city.
dude I totally agree boxxers are much better and I used a new fox rear shock and I wasn't as smooth as my 04 fox rear shock witch has a much thinner shaft