Tanzania is best before it hits 2nd cracks, and depending on personal taste, you may find you like it roasted quite light, where the good ones will be complex enough and with brightness that you could call it a poor man’s Kenya. The average Tanzania lends itself to blending, and will especially add a nice dimension to an otherwise rough Sumatra.
Although its uncommon, you occasionally see a natural-sundried Tanzanian coffee for sale. These have intense sweetness and are best roasted very light, similar to a natural Ethiopian.