Which anti hypertensive is best for type 1 diabetes?

angiotensin converting enzyme inhibiters

Drugs acting on renin-angiotensin system, i.e., Angiotensin-II receptor blockers (ARBs) e.g., Azilsartan, Valsartan, Telmisartan and Angiotensin converting enzyme inhibitors (ACE-I) e.g., Ramipril, Enalapril.

Angiotensin converting enzyme inhibitor is the best as captopril and other ــــpril which also help in the improvment of the complication of diabetes such as nephropathy so  it consider to have dual action 

Angiotensin II receptor blockers