Ok, so you have found a so-so juice that happens to be better than the others that you have tried.
Finding a so-called "all day vape" is over-rated in my opinion, but I think I understand the real issue here. You've only tried a few flavors so far, and possibly only from one juice vendor. The eGo Twist is a proven beginner variable voltage battery, so I don't think your disappointment should be focused on the battery device. Perhaps it is the juice, or even the juice delivery device you are using on the Twist.
Finding a couple of good juice flavors can be as important as finding the right gear to vape it on. Most of us have experiemented with multiple flavors from multiple juice vendors before we found ONE FLAVOR we didn't mind using all day. It's unfortunate but true. Taste in e-liquid flavors is extremely subjective. What one person likes, another person might find revolting, and vice versa.
The best way to find good flavors is to find vendors that offer "sampler packs". These are smaller bottles of flavors grouped in a 2 or 4 pack package to trial their juice in hopes that you will find some that you like and will return your business with buying again in a larger size bottle. This allows you to sample many flavors at a reduced cost; you won't be spending (and possibly wasting) a lot of money on a large bottle of juice you may not like.
Read the juice sub-forum here to get some ideas on flavors you might like to try, and vendors that offer a variety of flavors to choose from. Some names come up quite often, so pull up their website and see if they offer something that you would like to try. Finding an all day vape can be elusive for some people. It is not uncommon to go through 20 flavors and find only 2 or 3 that you like. It is very hit or miss.
What type of delivery device you use can also affect how much satisfaction you get from your vape. Each type of device is constructed a little differently to provide a different vaping experience. Everyone ends up preferring one type over another, but you won't know which one you prefer until you've tried 2 or 3 out to compare them.
I've put together a type of picture dictionary of the more common juice delivery devices available for new vapors in the below link. It gives a brief description, shows a picture of what it looks like, and has a video of its use:
http://www.e-cigarette-forum.com/forum/blogs/baditude/3230-1-proper-terminology-carto-tank-what-primer-juice-delivery-attachments.html