You said you were looking for:
-Better vapor production?
Vapor depends on a balance of heat and juice. You need a good electrical supply, and a "topper" atty, carto, etc that delivers juice at a consistent rate. An ego will do this reasonably well, there are bigger that are not always better.
-Longer battery life?
This is where a mod will shine! A mod with a good quality 18650 has to last longer. If you can't get at least most of a day out of one, you really need to put it down once in a while...
-Less burnt hits?
No, BUT with a VV, variable voltage mod you can turn the volts down, one of the main reasons for burnt hits. VV is like cooking on your stove, if you always turn the light up to max, you can burn water...
-Build quality?
Maybe, depends on what mods you're looking at, there are some very nice ones. That said I have a 650-mah ego battery that still holds a charge very well, vapes nicely, and it's only a bit over 3 years old. I had two other ego's of the same age that I destroyed by my own misuse, stupidity. I've owned mods, VV and straight mech, store bought and homemade. The vapor produced depended mostly on the "topper" I stick on them, and the juice I'm using.
If you're looking for a cheap way to try something different, anything different, 'cause everyone is buying ____ (fill in the blank) and it's just so OOHHHHH SHINEY!!!! Resist the impulse, and check some of the "Bargain Bins" on the vendors sites, look for some 306 or 510 atomizers / attys, and try dripping at home. They're cheap these days, vape very well, and are a fun change.
Shopping around the "Bargain Bins" will give you a chance to also see some of the simple mods available, read some reviews, check prices from different vendors, basically window shop a bit.