BA...hands down. Service from LHR to DAR, Kili, NBO....you can pick. I did the 16 hour layover in London on my way to Nairobi and took the Tube into Piccadilly and spent the day seeing sites and even got a nap in at Green Park.

Service was impeccable. I had a coach seat on a 777. Security was tight, but I had no problems.

If Dar is your only destination, that should suffice.

Out of Dar, Precision is probably the best...they are 49% owned by Kenya Airways.

Coastal--if you're ok on Single Cesnnas.