I prefer to just stick to the facts and compare how both of them have been beating their opponents. Anderson finished Vitor with 1 offensive strike and made Bonnar look stupid. Jon Jones struggled against both of them and almost got submitted by Vitor.
Anderson Silva has a better highlite reel of finishes and most of them come before the end of the 2nd round. Jon Jones is good and yes his size does have an impact on his fights and I dont think anyone is foolish enough to dispute Jones' obvious size and reach advantage which dwarfs most of his competition.
Silva has also fought outside of his weightclass and remained just as dominant. Could Jon Jones be just as dominant against someone his size? How would Jon Jones do against Bigfoot, Nog, or any fighter in top 5 where he looses his physical advantage?
Will Jon Jones be able to perform like AS does at the age of 38? Will he be a champion by the time? There are too many unanswered questions to even entertain Sonnen's opinion which has proven to be categorically incorrect in the past anyways.
Just about everytime Sonnen has claimed someone was going to win they ended up getting their ass handed to them. I would take Chael's little opinion with a grain of salt.
Best Fighter on the planet.