The Marriott website sets forth the benefits.
https://www.marriott.com/loyalty/member-benefits.mi
The FT consensus is that the most worthwhile benefits don't begin until Platinum Elite.
You can get a 15-EQN head start each year by obtaining the Marriott
BONV°Y AmEx card with an annual fee of £95, in which case 10 more nights would get you to semi-worthwhile Gold Elite status.
https://www.marriott.com/credit-card...redit-cards.mi