The world cup is easier to win than the UCL?
Pleaseeeeeeeeeeeee be joking. No chance.
Even from a pure tournament stand point (1 leg vs 2 legs etc), I still disagree. 1 leg is harder, if you play poorly you are gone. In the champions, you have a second chance.
Ancelotti and Mourinho have never coached on the international level. How do they know? If your country has not got or produced the talent you will not win. Simple.
Today on the club level, money is the key. Look at City, Chelsea, PSG, Real. $$$ The UCL can be eventually be bought, the world cup cannot. Except for Real & Chelsea, none of the teams i mentioned have won the champions league but lets face it due their $$$ they are closer to winning it than Milan are. It wont be long before City and PSG win the champions league. Just like Chelsea did, they were nothing but eventually got there.
If the World cup is easy to win, lets see Ancelotti or Mourinho take over a team like Australia and win? They wont. They have a better chance of taking over a team like Torino for example and winning the champions league. All it takes is money. Rich arab buys Torino, invests money. They are now competitive.
You can pour all the money you want into a Country's football program, but there is no guarantee the country will produce the talent. If it they do, it takes generations to achieve. Ie Belgium's current generation. Look at Netherlands, Portugal. The talent those countries have produced is exceptional but neither have won the world cup.