Personal stand point, this goes back to 2001 King of the ring IMO, WWE realized that it had to much talent (with the WCW purchase) decided on building on their own talent OVER the WCW guys, now Edge and Christian had run their course, multiple time tag team champions, now at the time the rumors going into the KOTR was that Edge would end up facing Christian, now at this point both Edge and Christian were heels but Edge was over the crowd, and looking at the KOTR tournament they pretty much had him look good over Rhyno (who's not been beating on a WWE PPV) then over Kurt Angle, so Edge looked a worthy winner after all was said and done.
Now this pretty much started the feud, Christian being jealous, so move on two months at Summerslam, Edge beats Lance Storm in a pretty good opener, Christian isn't even on the card, they do a backstage skit with Lita and Matt congratulating Edge with Christian coming in and "trying" to spoil the moment announcing on RAW he'd face Hardy for the European belt, and anotehr with Edge on the phone to Grandma Edna, and the grandma hanging up on Christian, then 2 weeks later in their home town, the big heel turn.. problem was WWE had Christian jump the alliance, that wasn't needed, Unforgiven came and Christian won the belt, IMO they should of had Edge retain, and built up Christian at No Mercy, they didn't Edge won a pretty good and brutal ladder match, and for the US fans they missed IMO the best match of the PPV 3 (rebellions cage match with the old style cage match) anyways the in this time period Edge started to have some good singles matches, with Test, Regal, Angle, what did Christian get in the mean time? a European title match with JBL that didn't even get shown on tv (it was done at a smackdown taping) and then pitted with Test to feud with Albert the happy hippo and Scotty 2 Hotty, Wrestlemania X8 both were in matches that could of/should of been better, tho Christian had the far more entertaining role that night in the hardcore title match, following month the brand split, Christian got lost in the shuffle, Edge on the other hand flurished with matches with Angle x2, tagging with Hulk, decent matches with Eddie, along with a couple of classics with Rey vs Benoit and Angle, then came his neck injury, Christian in that time period was tagged up with Jericho, which is good but his singles career was none existent, 2003 didn't start much better, for Christian until Judgment day when he got his push with the IC Title, however come summerslam 2003 no Christian on the card which was/is a shame, however after RVD won the title (to pass to Orton) Christian was left without anything big until Wrestlemania 20 when Jericho made Christian look awesome, after that WWE dropped Christian, 2004 was pretty lack luster for him, minus the Jericho feud, and 2005 wasn't much better till he left, Edge done very little in his return in 2004 until the whole Lita/Matt/Edge love triangle came about in Feb 2005, WWE had the biggest "real life" heel in years, so they pushed him to the high hilltops, which wasn't a bad thing as people paid to see him get beat down, but that was what pushed Edge over the line, Matt Hardy tho he's good and fans marked out for him, was unable to get that consistent main event feud, Edge went on to cash in his money in the bank, win the title pass it back to Cena, Feud with the lovable Mick Foley have the best hardcore match in Mania history, then go on to feud with Cena again, along with joining up with Foley which in my opinion was the best angle in 2006, he should he could adapt to feuds, then won his 2nd world title on RAW and relighted the Cena feud, then joined up to create Rated RKO, probably the best make shift tag team of the 2000s generation, 2007 Edge went from strength to strength and cashed in his "newly won" MITB against The Undertaker, which played out beautifully, Edge got injured returned relighted the undertaker feud, Mania 24-Summerslam 2008 Edge had constant main event level matches with the Undertaker, Edge left when he returned again looked sleazy heel but was main event level, Christian's TNA time I'm not familiar with hense how I haven't talked about it but winning the TNA title twice showed Christian had that main event feel to him, since returning to WWE he's won the ECW title, hopefully WWE will push him constantly and have him move to Smackdown, as there is some decent feuds in line for him, Edge is in need of a face turn but he's shown he's a worthy main eventer, shame about the short title runs as he can been a good champion, but IMO he'll get his long World title run soon, and I could see Christian winning the SD version of the world championship.