Both of them would have done well even if they had swapped clubs imo. Morata would have linked up well with United's attacking trio and Lukaku would have offered a physical presence similar to Costa at Chelsea.
I said it from the off though and I still believe it, Morata was much more suited to our style of play once our front 3 of hazard pedro morata actually play together.
I've watched Hazards link up with lukaku at belgium and I don't feel that understanding is completely there, with Morata it certainly will be.
Both are quality forwards, period. Conte and Mourinho were happy as long as they got one of them.