Are you insane? I have given you more than GDP in fact I took time to number them for you like I would do for my 4 yr old daughter. Those are statistics from IMF and World bank. Quit the sophistry and look at the information, I am reposting for you. In fact let me add headlines to make it easy for you.
GDP
i) Your economy is a baby compared to Kenya, it is still a backwater economy struggling with a legacy of communism while Kenyan economy is an established market based economy thriving on diversification. Tanzania has a GDP of $64 billion(2020 estimate) while Kenya has a GDP of $109 billion (2020 estimate).
education
ii) Your education is crap, nobody in the world will take you seriously if you mention any Tanzanian university as your alma mater. In fact University of Nairobi is ranked as the Top university in east and central africa, followed by Makerere in Uganda.
Healthcare
iii) Your healthcare is horrible, life expectancy of a kenyan is 4 years more than a Tanzanian and you have higher rate of malnutrition than Kenya, which has led to 40% of your children having stunted growth and over 50% having an ill developed brain into adulthood(I see why you guys always live in LALA land). Also you still need help from doctors without borders in your main referral facility since you guys don't have the brains.
Kenya also has more hospital beds per 1000 people only second to south africa in sub saharan africa, and the second highest number of critical care beds per 1000 people in sub saharan africa after south africa
Infrastructure
iv) Your infrastructure is virtually non existent that is why Kenya is ranked the most developed country in east and central africa and Nairobi as the 4th most developed city in Africa. We have bigger and better roads, bigger and better port (In fact bigger than all your 4 ports combined), we have all our rails functioning (In fact the 200km Nairobi to Nanyuki MGR carries more cargo in a month than TAZARA has hauled in 50 years)
Diplomatic Missions
v)On international diplomacy you have nothing, the Unep HQ is in Kenya. The diplomatic missions of majority of the countries report to Kenya based offices. The largest eu office outside brussels is in Nairobi, the largest american embassy in Afrika is in Nairobi, the israel embassy in Nairobi covers the whole east and central africa.
Inequality
vi) Many tanzanians dream that kenya is extremely unequal compared to Tanzania the facts show the truth. Tanzania has more millionaires than Kenya yet 60% of Tanzanians live below the international poverty line which is $1.9 a day with more living in extreme poverty. In comparison only 32% of Kenyans live below $1.9 a day.
Tanzania like many african countries is chock full of natural resources yet somehow still manages to be a generally poor country, like the DRC (Who have been at war since I can remember), Tanzania has Gold, Tanzanite etc but you can not use these resources to benefit your population. You still remain a poor country.