As far as what has the most acclaim, certainly, without a doubt in my mind, the eGo is the most famous and loved on here.
Best atomizer, again, just going with most used and loved I'd say 510 (LR, carto, etc) wins overall.
If we're talking straight up best you're wandering into the murky waters of Mod Country. Mods will almost always perform better than any standard chinese made ecig battery. The modified atomizers that people make are often superior in durability and vapor production as well.
The thing about mods though, is that what makes them the best is dependent on the features you want out of them. Autofeed or juicebox built in? wetbox, ggts, reo, etc. High volt? Too many mods to list. Variable voltage? nucks fistpack, the buzz, chameleon.
There's just so much variety that in the world of mods it isn't what's best, it's what is best for you.