As much as it pains me (Boro fan) I think Newcastle are the bigger draw right now, yeah AC just won the league, but Newcastle will be able to offer more money and the EPL is by far the biggest league in the world, if you can come here to the potential of playing in a club that is going to be on the upward trajectory with the money behind them, I think its an exciting project to get on.
Also I genuinely think we might see an "outsider" potentially do well in the league this season with the WC break coming in. You think pretty much the whole starting 11 (bar Robertson & Mahrez from what I can think) of Liverpool & City are going to the World Cup, is there potential to come back knackered and struggle the second half? Then theres good numbers from Chelsea, Arsenal, Spurs, United. Whereas Newcastle have probably what? 3 players going? The rest get some good R&R/training in before ready to go for second half of the season.