I got my reg box mod almost 2 years ago, so my opinion was based on what was going on at that time.
At the time I decided to get one there was either DNA or Yihi to chose from for me. I think there were other chip sets but consensus at the time was that they were very "iffy"
There was also a lot, (so it seemed) boxes catching on fire, etc during the charging, or for no reasons at all.
I looked and read and asked about the differences, but didnt think that with my style of vaping that I needed bells and whistles.
For me the deciding factor, was the reverse battery protection. I KNOW that if I had one , just worrying about not placing it backwards would make me do it sooner or later. I cant see paying that much money and being able to so easily fry it.
Ive had my Kainos by MMV with a simple 60watt YIHI chip for almost 2 years and its never failed me.
If you would benefit from any of the bells and whistles , why not. If you dont need TC or other functions, go simple, less to go wrong.
Mine never goes up higher than 12.5 watts.
I also have a Provari P3 Stealth which has been good to me. I think it has too many functions, and having to scroll about, but Im the odd one.
Like someone else posted look for what you need in functions, find one that you like using as far as looks. How much you want to pay for "its looks" ; wood, plastic, steel, etc is all up to you. Just make sure you buy from a modder that offers to take care of the warranty themselves, since they put it together. I heard a lot of stories about how most modders send you to the Evolv site to look into the chip problems, and then who replaces it?
Some replace it, but make you get the chip and then who pays for all the shipping and inconvenience?
MMV has an amazing reputation and stands behind their customers even though they are in Greece. They dont make you feel like you the customer is always in the wrong.
Do your homework and find out about the modders "aftercare"