You post makes you look like a complete fool. Your grammar is almost as hilarious as your deluded views. Your bitter because a player may goes to Arsenal instead of United. "Arsenal participate then get knocked out of it"....only 1 team doesn't get knocked out of the Champions League every year.
Yea well Arsenal never won the CL and they usually get knocked out of it pretty quickly. I'am fully expecting Arsenal to be out of the CL as soon as things start to get serious. You may be in it, but you never play a role of significance. Even Moyes impressed me more in Europe than Wenger ever did and that is saying something.
If Sanchez prefers Arsenal because he can play 7 games in the CL and then get knocked out of it, he is short sighted and lacks serious ambition. I bet you United will win the CL again before Arsenal manages to even reach the final.