I know the question was for Trojan and the top levels, but here's my take on the mid-levels. Keep in mind that I personally feel that none of these levels are worth paying a significant amount of your own money for. But I got there as a biz traveler, so here ya go...

(1) HH Gold - free breakfasts and a pretty good upgrade rate. Exceptional upgrades on award stays in Hawaii, and I've never had Hilton pull an "out clause" on me for benefits because they had labeled a property as a "resort". The two Hawaiian "resort" stays came with breakfasts, upgrades, and other perks like free water bottles and fitness center access.
(2) MR Gold - I get little from the hotels with this status besides concierge level upgrades, usually with a lounge that isn't open. The EEO booklets are nice - we use the 2-for-1 certs quite often. I will miss those next year when my status drops off to Silver.
(3) SPG Gold - I never noticed much difference between being a base member ("Preferred Plus") and a Gold. Yes, Gold gets more Starpoints, but the actual at-hotel earning in SPG is so weak that it hardly matters. All of my Starwood stays result in a "Preferred Room" - a very minor upgrade to a high floor or similar.

To credit Marriott, I find that their overall service (both at hotels and service for the rewards program) is the best. I don't mind losing my Gold because I know I'll still get nearly identical (consistently good) treatment as a Silver. If this post sounds at all like a knock on Marriott, it's a knock on their mid-tier elite level and nothing else.