Kiev is the capital with a history of more than 1000 years. Donetsk is an industrial city founded in the 19th century. If you want to see a beautiful city in Ukraine, then Lviv. It's most beautiful city of Ukraine unlike any other.I have been to Kiev twice and Donetsk twice. My view is Kiev was more "European" Donetsk, more "Communist" By that I mean it had wide roads for parades, Rusty infrastructure, (I put my foot through the floor of a rusty tram!) Tanks on plinths and I think, Statues to Russian politicians.
Kiev had a more Western approach, wonderful looking women, Impressive Metro system, (albeit so deep that I swear the land around the platforms was getting hot!)
I just hope something could be sorted out.
3 Weeks after the last time I went to Kiev, The Maiden square revolution took place , so if anyone wants photos of what was destroyed in Kiev, just pm me!