HH Gold is a nice status, considering how easy it is to get. I do a lot of weekend stays, so I like the fact that most Hiltons find a way to get you a continental breakfast at a hotel restaurant even when the lounge is closed. Marriott doesn't do this.

Starwood Gold is nice in that they never hassle you about your benefits when staying on a travel agent booking. I've nevere scored a huge upgrade with Gold status, but I always get a smile and a preferred room (high floor, nice view, sometimes lounge access) even on dirt cheap rates. The Four Points I stay in sort of regularly on a $34/night Priceline rate always includes free breakfast and 2 free drinks.

Marriott has a solid rewards program and a lot of wonderful hotels, but they don't do much for their Silver/Gold elites. Sometimes upgrades; Lounge access for Golds when it is open. No breakfast when it is not. No breakfast at any property that Marriott decides to call a "resort". (As opposed to a "hotel", I guess...)

Of the smaller chains, Fairmont seems to treat its program members well even when they have no status. I have received upgrades and invitations to manager's receptions (basically a nice form of lounge access) just for having a base membership number in my record. Although Fairmont is a luxury chain, I always find myself checking their website for specials. Once in a while I find a promo rate that is very attractive.