Ok, I play tested a lot with and against both armies:
DE weaknesses:
1. Over all expensive troops, that have elite profiles (all WS and Bs 4).
2. T 3 lords and weak As (unless you play the storm of chaos army: Cult of slaanesh)!!!!!
3. Can\'t do too much harm in CC (ok, beside cold one cavallery and chariots-the others just get killed before they can strike).
Ogre weaknesses:
1. More expensive troops and armies that count 30 models at the best (unless you use gnoblars, that you hate).
2. Almost no As (4+ at the best in CC with iron fists used as shield-wich is higly unlikely, as you\'ll always use them as 2nd hand weapon and therefore prefere the 2nd hand weapon since it\'s 1 point cheaper)
3. Really succeptible to ranged fire (they tend to start panicing after the first cannonball hits them)
4. Really weak combat resolution (ok, they cause impact hits and have a lot of attacks, but Ws 3 and S 4 means that you won\'t hit too much and not many wound would get through As, while you\'ll always be outnumbererd and out ranked and in most cases flee from combat just after charging-unless you use the gnoblars you hate)
5. Weak magic (you can\'t take the slaughter master unless there\'s a Tyrant in the army, wich means no heavy magic option under 3000 pts-therefore any competent tournament army will simply dispell what you manage to cast with the few power dice you get)
I would say that DE is more flexibile and competitive army-don\'t get me wrong, you can win with ogres, and if well used they can be really powerfull, but against certain armies, that usually appear at tournaments, they suffer greatly, while DE can be arranged into something more adaptabe and fast.