I've stayed in both the Marriott and the Renaissance hotels in Minsk over 5 times each in the last 16 months. I'm a Marriott Platinum member. In my experience the Renaissance is consistently more generous with room upgrades than the Marriott. I also find the evening food selection in the lounge at the Renaissance more interesting. However the Marriott always has food out all night until the lounge closes, the Renaissance only for 2 hours.

Both hotels are very good value for points!