Which major hotel chain has the best elite program?

I am not interested in reward level/program comparisons as that was covered by another discussion (hopefully someone will add the link) but rather the TYPE and AVAILABILITY of lowest-tier elite benefits, i.e. room upgrades, freebies, concierge floor access, etc.

For example, the Wyndham program has provided me with free upgrades and nice welcome baskets. Contrast to comments on the Marriott board indicating the rarity of room upgrades, even for top elite levels.

I am particularly interested in your personal experiences with Marriott v. Hyatt v. Hilton v. Starwood v. Priority Club as these chains appear to have 3*-4* hotels in most major US business cities.

Thanks for your input.