All the different kinds have their good points, and maybe not so good points.
I have a couple of iTaste vv3s, and what I like best about them is that they won't roll off of whatever I lay them on, and the really big digits on the screen mean I can see it clearly even without my reading glasses, which is awesome when I'm out in the truck wearing sunglasses. Their battery life isn't too long, just 800 mAh, but I have two, and will be getting a 3rd soon, so not a *huge* deal, especially if I'm just around the house or just out for a short errand.
I have a Sigelei zmax v3 flat-top, which is great because it uses removable batteries, and when you stack 2 18350s in it, I can get nearly 3 days battery life, so that's great for a longer all-day trip. But yeah it's kinda heavy with stacked batteries, so that's kind of a downside, though I personally don't mind it. It's good to use that one with my kayfun glass tank, because the mod itself is so heavy that the fat glass tank doesn't make it top-heavy.
Lately I've just been using my red ARO Winder (which is very much like an eGo Twist), because it matches my red ARO Pyrex, and lately I've just been vaping pineapple, which needs the glass/pyrex -- but that booger is 1100 mAh, so I have no issues with battery life at all. And it's just so danged pretty! Love that deep shiny red, it's gorgeous!
In short, there's all kinds of mods for all kinds of moods -- whatever suits you at any given time, that's the one to use! Not one thing wrong with eGos, especially if they're REAL eGos and not the $10 variety from China or Hong Kong -- I have one of those, and it recently came apart, the collar from the bottom part of the battery. The wires are all still connected, but I now consider that one an 'emergency only, last-ditch' resort, because of the coming-apart business, and I sure won't be buying anymore of those. But $25-$30 mods, even the eGo type, still a very good buy!
Andria